1. The members of subphylum Vertebrata possess notochord during the embryonic period. 2. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Regarding 1 and 2:

Question

( a ) 1 is incorrect but 2 is correct
( b ) Both are incorrect
( c ) 1 is correct but 2 is incorrect
( d ) Both are correct