Read the following statements. 
(a) Organ systems in different groups of animals exhibit various patterns of complexities.
(b) Any plane passing through the central axis of the body divides a radially symmetrical organism into two identical halves.
(c) An undifferentiated layer called mesoglea is present in between the ectoderm and the endoderm in coelenterates.
(d) Notochord is formed on the ventral side during embryonic development in chordates.
Choose the correct answer from the options given below.

• A

  Only (a) and (b) are correct

• B

  Only (b) and (c) are correct

• C

  (a), (b) and (c) are correct

• D

  (a), (b), (c) and (d) are correct