The following are some features observed in the animal kingdom:

A. The body is dorsoventrally flattened.
B. Possess a water vascular system used for locomotion, feeding, and respiration.
C. Exhibit radial symmetry in adults and bilateral symmetry in larval stages.
D. Endoskeleton is made up of calcareous ossicles.
E. Exclusively marine organisms.

Select the correct set of features characterizing the phylum Echinodermata: