Phylum Echinodermata : 1. Digestive system is complete 2. They have mouth on the upper (dorsal) side 3. Anus is on the lower (ventral) side. Regarding 1,2 and 3:

Question

( a ) 2 is incorrect but 1 and 3 are correct
( b ) 1 is incorrect but 2 and 3 are correct
( c ) 3 is incorrect; 1 and 2 are correct
( d ) 1 is correct but 2 and 3 are incorrect