Read the following and identify the correct one.

• A

  In Cephalochordata, notochord is present only in larval tail.

• B

  In Urochordata, notochord extends from head to tail region.

• C

  In Urochordata, notochord is present only in tail of adult.

• D

  In Cephalochordata, notochord extends from head to tail region.