1. In Urochordata, notochord is present only in larval tail. 2. In Cephalochordata,notochord extends from head to tail region 3. In Cephalochordata,notochord is persistent throughout their life. 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 ) All are correct
( d ) 3 is incorrect; 1 and 2 are correct