Class – Osteichthyes : 1. Sexes are separate. 2. Fertilisation is usually internal. 3. They are mostly oviparous 4. Development is direct. Regarding 1,2,3 and 4:

Question

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