Select the characteristics that Coelenterates possess.
 

Concept: Organisms that have only two germ layers during their embryo face are called diploblast. Cnidarians are diploblasts. 
Organisms with radial symmetry can be divided into two equal halves with any plane passing through the central axis. Cnidarian shows radial type of symmetry. 
Coelenterate live in aquatic habitats. They can be free swimmers or sessile and show tissue level of organisation.
Hence, option A,B and D are the correct answers.