The four defining characteristics of chordates are
A. segmentation, a dorsal hollow nerve cord, pharyngeal pouches, and an amniotic egg.
B. a dorsal hollow nerve cord, a notochord, bilateral symmetry, and mammary glands.
C. bilateral symmetry, segmentation, a well-developed coelom, and limbs.
D. a well-developed coelom, pharyngeal pouches, a notochord, and jaws.
E. pharyngeal pouches, a dorsal nerve cord, a notochord, and a postanal tail.