Regarding Class Cyclostomata : 1. They have paired fins 2. Their body is devoid of scales. 3. Cranium and vertebral column are bony. 4. Circulation is of closed type Regarding 1,2,3 and 4:

Question

( a ) 2 is incorrect; 1,3 and 4 are correct
( b ) 1 and 3 are correct but 2 and 4 are incorrect
( c ) 3 is incorrect; 1,2 and 4 are correct
( d ) 1 and 3 are incorrect but 2 and 4 are correct