Select the correct set of characteristics of phylum Echinodermata.

Body is unsegmented; gills are feather-like; gills have respiratory and excretory functions; usually dioecious and oviparous.

All are marine with organ-system level of organisation; they are triploblastic and coelomate; have an endoskeleton of calcareous ossicles.

Worm-like marine animals with organ-system level organisation; they are triploblastic and coelomate; body is divided into proboscis, collar and trunk.

The body is covered by chitinous exoskeleton; they have jointed appendages; respiratory organs are gills, book gills, book lungs or tracheae.