Regarding Molluscs : 1. Body is covered by a calcareous shell 2. Body is unsegmented 3. They have a distinct head, muscular foot and visceral hump Regarding 1,2 and 3:

Question

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