Mark and Jack work as clerks at the New Bank of North America, which they plan to rob. In order to plan and execute the robbery, Mark and Jack obtained the floor plans of the bank, studied security arrangements and movements of security personnel. They even got weapons, in case force is required, as they plan to rob the bank during working hours. But the police got information about the plan and arrested Mark and Jack, and thus prevented the robbery from taking place. Which of the following crimes have Mark and Jack committed?