In Mollusca : 1. The posterior head region has sensory tentacles. 2. The mouth contains a file-like rasping organ for feeding 3. The file-like rasping organ for feeding is called morula 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 ) 2 is correct but 1 and 3 are incorrect
( d ) 3 is incorrect; 1 and 2 are correct