Class – Osteichthyes : 1. Air bladder is present 2. Air bladder regulates buoyancy (if present in any aquatic organism). 3. Heart is two- chambered 4. Heart has one auricle and one ventricle. Regarding 1,2,3 and 4:

Question

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