How many characters in the list given below are true regarding echinodermata. I. Endoskeleton of...

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How many characters in the list given below are true regarding echinodermata.
I. Endoskeleton of calcareous ossicles.
II. Mostly marine.
III. Larva are radially symmetrical.
IV. Fertilisation is generally external.
V. Mouth is on dorsal side and anus on ventral side.
VI. Excretory organ is gills.
VII. Development is indirect.
(a) Two
(b) Three
(c) Four
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