AT 235 Weather

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1. Which gas is not a greenhouse gas?
a. Water Vapor
b. Oxygen
c. Carbon Dioxide
d. Methane

B

2. Where are dew point temperatures typically the highest in the summer?
a. Southeast U.S.
b. Northwest U.S.
c. Northeast U.S.
d. Northern Plains.

A

3. An ASOS (Automated Surface Observing System) does measure.
a. Visibility
b. Virga
c. Snowfall
d. Clouds above 12000 Feet

A

4. If the water content of air remains constant through the day, the relative humidity will be largest during the afternoon.
a. True
b. False

False

5. The most abundant gases in the atmosphere by volume are:
a. Carbon Dioxide and Nitrogen
b. Nitrogen and Oxygen
c. Carbon Dioxide and Oxygen
d. Oxygen and Water Vapor

B

6. Specific Humidity is typically higher at the poles?
a. True
b. False

FALSE

7. The part of the atmosphere we live in is called:
a. Troposphere
b. Mesosphere
c. Ionosphere
d. Stratosphere

A

8. In order from bottom to top, the layers of the atmosphere consist of:
a. Stratosphere, Troposphere, Thermosphere, Mesosphere
b. Troposphere, Mesosphere, Stratosphere, Thermosphere
c. Thermosphere, Mesosphere, Stratosphere, Troposphere
d. Troposphere, Stratosphere, Mesosphere, Thermosphere

D

9. The amount of force exerted over a surface area is called:
a. Density
b. Weight
c. Pressure
d. Temperature

C

10. The shortest day of the year in Alaska occurs at the:
a. Winter Solstice
b. Spring Equinox
c. Fall Equinox
d. Summer Solstice

A

11. The cold feeling that you experience after leaving a swimming pool on a hot, dry, summer day represents heat transport by:
a. Latent Heat of Condensation
b. Conduction
c. Radiation
d. Latent Heat of Evaporation

D

12. What is the Standard Atmospheric Pressure?
a. 1013.25 mb
b. 10 mb
c. 100 mb
d. 850 mb

A

13. The maximum in daytime surface temperature typically occurs ____ the earth receives its most intense solar radiation.
a. Before
b. After
c. Exactly When

B

14. The process of changing water vapor to ice is called Deposition.
a. True
b. False

TRUE

15. Which object has the lowest albedo?
a. Snow
b. Bare Soil
c. Green Grass
d. Asphalt

D

16. What is the most variable gas in the atmosphere?
a. Carbon Dioxide
b. Oxygen
c. Water Vapor
d. Nitrogen

C

17. Conduction is the process of heat being transferred from:
a. Low pressure to high pressure
b. Cold objects to hot objects
c. High pressure to low pressure
d. Hot objects to cold objects

D

18. During a radiation inversion, farmers can use wind machines to reduce the inversion?
a. True
b. False

TRUE

19. The blueness of the sky is mainly due to:
a. Scattering of sunlight by air molecules
b. Presence of water vapor
c. Absorption of blue light by the air
d. Emission of blue light by the atmosphere

A

20. The sun emits a maximum amount of radiation at wavelengths near ____, while the earth emits maximum radiation near wavelengths of ____.
a. 0.5 micrometers, 30 micrometers
b. 0.5 micrometers, 10 micrometers
c. 10 micrometers, 30 micrometers
d. 1 micrometer, 10 micrometers

B

21. During the summer in the Southern Hemisphere, the "Land of the Midnight Sun" would be found:
a. Antarctica
b. Equator
c. Alaska
d. Tropics

A

22. The lag in daily temperature refers to the time lag between the:
a. Time of maximum solar radiation and the time of maximum temperature
b. Time of minimum temperature and the time of maximum solar radiation
c. Minimum and maximum temperature for a day
d. Sunrise and sunset

A

23. The state of the ionosphere is critical to radio communications
a. True
b. False

TRUE

24. A minimum temperature of 32°F is forecasted for a cloudy, windy night. Suddenly the wind decreases and remains light overnight as the skies clear. The actual temperature would most likely be:
a. Lower than forecasted due to mixing
b. Higher than forecasted due to mixing
c. Right on
d. Lower than forecasted due to maximum radiational cooling

D

25. Sun angles are highest at what time of year?
a. Winter Solstice
b. Spring Equinox
c. Fall Equinox
d. Summer Solstice

D

26. The process of condensation warms the air.
a. True
b. False

TRUE

27. Ozone is found in what part of the atmosphere?
a. Mesosphere
b. Troposphere
c. Stratosphere
d. Thermosphere

C

28. The hotter the object, the longer the wavelengths
a. True
b. False

FALSE

29. The Earth would be ____ if there were no greenhouse gases?
a. Cooler
b. Warmer

A

30. Which slope receives the most solar insolation?
a. North
b. South
c. East
d. West

B

31. On a clear, calm night, the bottom of a valley will be colder than the adjacent hillside.
a. True
b. False

TRUE

32. Mesonet Weather Stations are helpful in forecasting in remote areas.
a. True
b. False

TRUE

33. Warmer Air can hold more water than colder air.
a. True
b. False

TRUE

34. If the air temperature increased, with no addition or removal of water vapor, the actual vapor pressure would:
a. Increase
b. Decrease
c. Stay the same

C

35. If the air temperature increased, with no addition or removal of water vapor, the saturation vapor pressure would:
a. Increase
b. Decrease
c. Stay the same

A

36. The Earth both absorbs and emits radiation
a. True
b. False

TRUE

The redness of the sky at sunset is mainly due to:
a. Scattering of sunlight by air molecules
b. Presence of water vapor
c. Absorption of blue light by the air
d. Emission of blue light by the atmosphere

A

38. Water Vapor is:
a. A cloud droplet
b. A rain drop
c. A gas
d. All of These

C

39. A maximum temperature of 72°F is forecasted for a clear and calm day. Suddenly the wind picks up and it becomes cloudy. The actual temperature would most likely be:
a. Higher than forecasted due to mixing
b. Higher than forecasted due to radiational heating
c. Right on
d. Lower than forecasted due to mixing and cloudiness

D

40. A radiational inversion is common when?
a. The wind blows on cloud free nights.
b. The wind blows on cloudy nights.
c. It is calm and cloud free
d. It is calm and cloudy.

C

41. Why is Ozone so important?
a. Helps pilots communication
b. Destroys Chlorofluorocarbons
c. It is wicked cool to say
d. It helps protect the Earth's surface from harmful UV radiation.

D

42. An ASOS can detect Virga
a. True
b. False

FALSE

43. Radiation is absorbed and emitted by the Earth's Atmosphere.
a. True
b. False

TRUE

44. A temperature inversion could be potentially dangerous for aviation safety.
a. True
b. False

TRUE

45. The horizontal transport of any atmospheric property by the wind is called:
a. Convection
b. Advection
c. Radiation
d. Epic

B

46. Which of the following variable/s always decreases with height
a. Temperature
b. Wind
c. Pressure
d. All of the Above

C

47. In an hilly region, the best place to plant crops sensitive to low temperatures would be:
a. Valley Bottom
b. On top of a hill
c. Anywhere that is dry
d. On the Hillsides

D

48. If very cold air is brought indoors and warmed with no change in its moisture content, the saturation vapor pressure of this air will ____ and the relative humidity of this air will ____.
a. Increase, Increase
b. Decrease, Decrease
c. Increase, Decrease
d. Decrease, Increase.

C

49. In a temperature inversion:
a. Air temperature remains constant
b. Air temperature decreases with height
c. Air temperature increases with height
d. It is warmer at night than during the day.

B

50. Over the earth as a whole, one would expect to observe the smallest variation of temperature from day to day and month to month here:
a. In the middle of a Land Mass
b. On an island near the Equator
c. Along the West Coast of North America
d. High in the Mountains in the middle of a Land Mass

B

1. Dew forms when
a. The air cools to its saturation temperature (dew point)
b. The grass or surface object is frozen
c. Both a and b
d. None of the above

A

2. Frost only occurs on grass when the grass's temperature is below 32 °F.
a. True
b. False

TRUE

3. Radiation Fog is most likely to form on:
a. Clear, calm nights
b. Cloudy, calm nights
c. Cloudy, windy nights
d. Clear, windy nights

A

4. Fog burns off the fastest where:
a. Middle
b. Edges
c. Top
d. Bottom

B

5. On a cold, winter morning, the most likely place for radiation fog to form is:
a. Over water
b. A side of a hill
c. In a valley
d. Top of a mountain

C

6. If fog is forming at Denver, Colorado, and the wind is blowing from the east, then the fog is most likely:
a. Evaporation Fog
b. Upslope Fog
c. Radiation Fog
d. Advection Fog

B

7. Which of the following would make the atmosphere more stable?
a. Cooling Aloft
b. Cooling at the Surface
c. Warming at the Surface
d. Warming Aloft
e. Both a and c
f. Both b and d
g. Both a and b

F

8. Large raindrops fall slower than smaller raindrops, and have a lesser terminal velocity than small raindrops.
a. True
b. False

FALSE

9. If an air parcel is given a small push upward and it continues to rise, the atmosphere is said to be:
a. Stable
b. Unstable
c. Adiabatic
d. Neutral

B

10. On an upper-level chart the wind tends to blow:
a. at right angles to the contour lines
b. parallel to the contours
c. at an angle between 10 and 30 to the contours and towards lower pressure
d. at constant speed

B

14. The difference between the "moist" and "dry" adiabatic rates is due to:
a. the fact that saturated air is always unstable.
b. the fact that an unsaturated air parcel expands more rapidly than a saturated air parcel.
c. the fact that moist air weighs less than dry air.
d. the fact that latent heat is released by a rising parcel of saturated air.

D

15. High Clouds can be higher in the ________ than the ________.
a. Poles, Tropics
b. Poles, Mid Latitudes
c. Mid Latitudes, Tropics
d. Tropics, Poles

D

16. The rate at which the temperature changes inside a rising (or descending) parcel of saturated air is called the:
a. The latent heat
b. Moist Adiabatic Lapse Rate
c. Environmental Lapse Rate
d. Dry Adiabatic Lapse Rate

B

17. A cloud that produces a halo around the sun or moon is called a:
a. Cirrocumulus
b. Altostratus
c. Altocumulus
d. Cirrostratus

D

18. A Lenticular Cloud can signify turbulence in the area
a. True
b. False

TRUE

19. Which of the following is not a way of producing clouds?
a. lifting air along a topographic barrier
b. lifting air along a front
c. warming the surface of the earth
d. convergence of surface air
e. sinking air

E

20. A cloud cover between 50-75% represents a ______ sky.
a. Clear
b. Scattered
c. Broken
d. Overcast

C

21. Polar Orbiting Satellites look at the same place on Earth all the time.
a. True
b. False

FALSE

22. Fog can sometimes have a positive contribution to farming.
a. True
b. False

TRUE

23. Hail is found in cumulonimbus clouds.
a. True
b. False

TRUE

24. Cloud seeding can be achieved both naturally and artificially
a. True
b. False

TRUE

25. Fog dispersion can be done via which method
a. Helicopter Mixing
b. Cloud Seeding
c. Heat the air by burning fuel
d. Both a and b
e. All of the above

E

26. Rain Shadows occur on the windward side of a mountain
a. True
b. False

FALSE

27. We can make an atmosphere more stable by _____ the lower atmosphere and _____ the air aloft.
a. Cool, Warm
b. Warm, Warm
c. Cool, Cool
d. Warm, Cool

A

28. ______ droplets have ______ vapor pressure than _____ droplets
a. Larger, greater, smaller
b. Smaller, lesser, Larger
c. Smaller, greater, Larger
d. Larger, lesser, smaller
e. Both c and d
f. Both b and c

E

29. The pressure in a _____ column of air decreases more ______ than in a _____ column of air.
a. Cold, slowly, Warm
b. Warm, slowly, Cold
c. Cold, rapidly, Warm
d. Warm, rapidly, Cold
e. Both A and D
f. Both A and B
g. Both B and C
h. Both C and D

G

30. Condensation nuclei are important in the atmosphere because:
a. they provide most of the minerals found in water
b. they make it easier for condensation to occur in the atmosphere
c. they are the sole producers of smog
d. they filter out sunlight
e. they provide the only means we have of tracking wind motions

B

31. Suppose we have profile like above, The cold layer at the bottom is 500 feet with a warm layer of 4000 feet. What type of precipitation should we expect at the surface
a. Rain
b. Snow
c. Freezing Rain
d. Sleet

C

32. On a weather map, troughs are:
a. Elongated areas of low pressure
b. Hurricanes
c. Tornados
d. Elongated areas of high pressure

A

33. Suppose we have profile like above, The cold layer at the bottom is 500 feet with a warm layer of 500 feet. What type of precipitation should we expect at the surface
a. Rain
b. Snow
c. Freezing Rain
d. Sleet

B

34. Suppose we have profile like above, The cold layer at the bottom is 3500 feet with a warm layer of 3000 feet. What type of precipitation should we expect at the surface
a. Rain
b. Snow
c. Freezing Rain
d. Sleet

D

35. If I took off from an airport where the temperature was cold and flew on a constant pressure surface to a point that was warmer than where I started, my elevation would be _______ than where I started.
a. Higher
b. Lower
c. Same

A

36. Wind tends to blow from High to Low Pressure
a. True
b. False

TRUE

37. The vertical motion of air caused by sun heating the ground is called:
a. Convection
b. orographic lifting
c. subsidence
d. convergence

A

38. Mares Tails often refer to which cloud:
a. Stratus
b. Altocumulus
c. Cumulonimbus
d. Cirrus

D

39. Advection Fog is common along the West Coast of the Lower 48.
a. True
b. False

TRUE

40. When does fog become classified as dense
a. Visibility > 6 miles
b. Visibility ≤ ¼ mile
c. Visibility > 3 and < 6 miles
d. Visibility >1 and < 3 miles

B

41. During the ice crystal process of rain formation:
a. only ice crystals need be present in a cloud
b. ice crystals grow larger at the expense of the surrounding liquid cloud droplets
c. the temperature in the cloud must be -40°C (-40°F) or below
d. the cloud must be a cumuliform cloud

B

42. Evaporation fog is also known as:
a. Advection Fog
b. Radiation Fog
c. Upslope Fog
d. Steam Fog

D

43. Which association below is not correct?
a. cirrocumulus - high cloud
b. cumulus - cloud of vertical extent
c. altostratus - high cloud
d. stratus - low cloud

C

44. _____ air aloft is normally associated with ____ atmospheric pressure, and ____ air aloft is associated with ____ atmospheric pressure
a. Cold, high, warm. Low
b. Cold, low, warm, high
c. Cold, high, warm, high
d. Cold, low, warm, low

B

45. When lines are tightly packed on a constant pressure or constant height surface, winds are lighter
a. True
b. False

FALSE

46. The temperature is cooler on the lee-side of mountains during a rain-shadow event.
a. True
b. False

FALSE

47. Which cloud can produce a dimly lit sky?
a. Altocumulus
b. Cirrocumulus
c. Altostratus
d. Stratus

C

48. Satellites can measure ice movement and vegetation.
a. True
b. False

TRUE

49. The Gas Law States:
a. Density is proportional to pressure times temperature.
b. Pressure is proportional to density times temperature.
c. Temperature times pressure times density remains constant.
d. Temperature is proportional to density times pressure.

B

50. An isobar is a line of constant:
a. Height
b. Pressure
c. Temperature
d. Moisture

B

1. Which of the following associations is most accurate?
a. Microscale - Eddies
b. Synoptic Scale - Eddies
c. Mesoscale - High Pressure Systems
d. Planetary - Lake Breeze

A

2. An EL Nino would mean what kind of winter weather for Alaska
a. Colder Than Normal
b. Warmer Than Normal
c. Wetter Than Normal
d. Drier Than Normal

B

3. Thermal turbulence above the surface is usually most severe:
a. at the time of maximum surface heating
b. around midnight
c. just before sunrise
d. about midmorning, or soon after the minimum temperature is reached

A

4. The wind's speed generally increases with height above the earth's surface because:
a. only the lowest layer of air rotates with the earth
b. air temperature normally decreases with height
c. wind instruments are not accurate at the earth's surface
d. friction with the earth's surface slows the air near the ground
e. air parcels expand and become less dense as they rise above the surface

D

5. A mT air mass can produce droughts if it moves over the central Plains in Summer.
a. True
b. False

FALSE

6. A wind rose indicates the wind speed at a location at a particular time
a. True
b. False

FALSE

7. Suppose a west wind of 20 knots blows over a coastal region which is densely covered in shrubs. If this same wind moves out over the middle of a large calm lake, its speed and direction would probably be:
a. greater than 20 knots and more northwesterly
b. less than 20 knots and more northwesterly
c. greater than 20 knots and more southwesterly
d. less than 20 knots and more southwesterly
e. less than 20 knots and westerly

A

8. It is the afternoon along a river in the mountains; I would expect to experience what kind of wind?
a. Monsoon Wind
b. Upslope Wind
c. Santa Ana Wind
d. Downslope Wind
e. Onshore Wind

B

9. The winter monsoon in eastern and southern Asia is characterized by:
a. wet weather and winds blowing from land to sea
b. wet weather and winds blowing from sea to land
c. dry weather and winds blowing from sea to land
d. dry weather and winds blowing from land to sea

D

10. On the eastern side of the Rocky Mountains, chinook winds are wet and cool.
a. True
b. False

B

11. A cP air mass in the winter over the central Plains can be refreshing?
a. True
b. False

FALSE

12. Which of the following produces the strongest Coriolis force?
a. fast winds, low latitude
b. fast winds, high latitude
c. slow winds, low latitude
d. slow winds, high latitude

B

13. Which of the following forces cannot act to change the speed of the wind?
a. pressure gradient force
b. frictional force
c. Coriolis force
d. none of the above

C

14. Which of the statements below is not correct concerning the pressure gradient force?
a. the PGF points from high to low pressure in the Northern Hemisphere
b. it is non-existent at the equator
c. it can cause the wind to speed up or slow down
d. the PGF points from high to low pressure in the Southern Hemisphere

B

15. When lines are tightly packed on a constant pressure or constant height surface, winds are lighter
a. True
b. False

FALSE

16. The Intertropical Convergence Zone (ITCZ) is a region where:
a. The polar front meets the subtropical high
b. The northeast trades meet the southeast trades
c. The northeast trades converge with the subtropical high
d. The Ferrel Cell converges with the Hadley Cell

B

17. In terms of the three-cell model of the general circulation, areas of surface low pressure are generally found at:
a. The equator and the poles
b. The equator and 30° latitude
c. The equator and the polar front
d. 30° latitude and the polar front
e. 30° latitude and the poles

C

18. According to the three-cell general circulation model, at the equator we would expect to find:
a. The ITCZ
b. low pressure
c. Cumuliform clouds
d. Light Winds
e. Heavy Showers
f. All of the above

F

19. On a weather map of the Northern Hemisphere, one would observe the westerlies:
a. North of the subpolar lows
b. South of the tropical highs
c. Between the doldrums and the horse latitudes
d. Between the subpolar lows and the subtropical highs

D

20. On a weather map of the Northern Hemisphere, the trade winds would be observed:
a. North of the Polar Front
b. Between the polar front and the subtropical highs
c. South of the subtropical highs
d. Between the subpolar lows and the subtropical highs

C

21. In a La Nina, colder than normal water and less convective rainfall is prevalent over the Western Pacific.
a. True
b. False

FALSE

22. In terms of the three-cell general circulation, the driest regions of the Earth should be near:
a. The equator
b. 30° Latitude
c. 60° Latitude
d. The poles

B

23. Surface winds blow across the isobars at an angle due to:
a. the Coriolis force
b. the pressure gradient force
c. the frictional force
d. the centripetal force

C

24. The wind around a surface high pressure center in the Northern Hemisphere blows:
a. cyclonic and outward from the center
b. cyclonic and inward toward the center
c. anticyclonic and outward from the center
d. anticyclonic and inward toward the center

C

25. On a surface weather map during the month of July, one would expect to find what type of pressure system over the desert southwest of the United States?
a. High Pressure
b. Low Pressure
c. Medium Pressure
d. No Pressure

B

26. Which of the following describes the polar front jet stream?
a. Stronger in Winter
b. Farther South in Winter
c. Forms near the boundary called the Polar Front
d. All of the above

D

27. The jet stream predominantly flows from:
a. North to South
b. South to North
c. West to East
d. East to West

C

28. The average winds aloft in the Northern Hemisphere are stronger in what season:
a. Summer
b. Winter
c. Fall
d. Spring

B

29. A mT air mass across the Southeast U.S. will bring:
a. Moist unstable air
b. Dry Stable air
c. Cold Dry air
d. Hot Dry air

A

30. Upwelling is:
a. The lifting of air over a mountain
b. The lifting of colder water from below to the ocean surface
c. Increasing heights in an upper level ridge
d. The lifting of air at a front

B

31. A good source region for an air mass would be:
a. Mountains
b. Generally flat area of uniform composition with strong surface winds
c. Near the Polar Jet
d. Generally flat area of uniform composition with light surface winds

D

32. An air mass is characterized by similar properties of ____ and ____ in any horizontal direction.
a. Pressure, Moisture
b. Temperature, Moisture
c. Winds, Pressure
d. Winds, Moisture

B

33. Which air mass is most likely to produce heavy valley rains and mountain snows along the west coast of the lower 48?
a. mP
b. mT
c. cP
d. cT

A

34. Wintertime mP air masses are less common along the Atlantic Coast of North America than along the Pacific Coast mainly because:
a. The water is colder along the Pacific Coast
b. The water is warmer along the Atlantic Coast
c. The prevailing winds aloft are westerly
d. The land is colder along the Atlantic Coast

C

35. Frontolysis means:
a. A front is dissipating
b. A front is overtaking another front
c. Severe Weather is present along a front
d. A front is strengthening

A

36. Occluded fronts may form as:
a. A cold front overtakes a squall line
b. Overrunning occurs along a warm front
c. A cold front overtakes a warm front
d. A warm front overtakes a cold front

C

37. Wave height depends upon:
a. Fetch Length
b. Wind Speed
c. Duration of Wind
d. All of the Above
e. None of the Above

D

38. Which of the following statements is true?
a. In winter, cP source regions have higher temperatures than mT source regions
b. In summer, mP source regions have higher temperatures than cT source regions
c. In summer, mT source regions have lower temperatures than mP source regions
d. In winter, cA source regions have lower temperatures than cP source regions

D

39. The wind around a surface low pressure center in the Northern Hemisphere blows:
a. cyclonic and outward from the center
b. cyclonic and inward toward the center
c. anticyclonic and outward from the center
d. anticyclonic and inward toward the center

B

40. The southern hemisphere has ____ semipermanent lows than the northern hemisphere.
a. Fewer
b. More

A

41. Average winter temperatures in Great Britain and Norway would probably be much colder if it were not for the:
a. Labrador Current
b. Gulf Stream
c. Canary Current
d. Greenland Current

B

42. A Cold Front is associated with a _______ wind shift and ____ drop in temperature
a. Gradual, Sudden
b. Sharp, Sudden
c. Gradual, Gradual
d. Sharp, Gradual

B

43. A Warm Front has ______ cloud changes and ____ rise in temperature
a. Rapid, Slow
b. Slow, Rapid
c. Slow, Slow
d. Rapid, Rapid

C

44. A Dryline is:
a. A stalled cold front
b. A stalled warm front
c. A dew point front
d. A boundary marking a strong horizontal change in atmospheric moisture
e. Both c and d

E

45. A weather warning indicates that:
a. the atmospheric conditions are favorable for hazardous weather over a particular region, but the timing and intensity are still in quesiton.
b. hazardous weather is either imminent or occurring within the forecast area.
c. hazardous weather is frequently observed in a particular region.

B

46. A persistence forecast could be quite accurate when:
a. a frontal system approaches your location at constant speed.
b. you are positioned in the middle of a large, stationary air mass.
c. the weather has been unusually cold for several days.
d. upper level winds blow straight from west to east.

B

47. Which forecasting method assumes that weather systems will move in the same direction and at the same speed as they have been moving?
a. Persistence forecast
b. Ensemble Forecast
c. Trend Forecast
d. Climatology Forecast

C

48. In winter, thunderstorms are most likely to form along:
a. Cold fronts
b. Warm fronts
c. Stationary fronts
d. Occluded fronts
e. All of the Above

E

49. Strong Santa Ana winds develop in Los Angeles during the fall when a _____ pressure center forms to the _____.
a. high, northeast of Los Angeles over the Great Basin
b. high, southwest of Los Angeles over the Pacific Ocean
c. low, northeast of Los Angeles over the Great Basin
d. low, southwest of Los Angeles over the Pacific Ocean

A

50. Newton's 1st Law States:
a. An object in motion shall stay in motion unless acted upon
b. An object at rest shall stay at rest unless acted upon
c. F=MA
d. Both A and B
e. None of the above

D

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