Coral reef forming coelenterates belong to the class

Q. Coral reef forming coelenterates belong to the class
A. Hydrozoa
B. Scyphozoa
C. Actinozoa
D. All of the above
Answer: Actinozoa

A. Hydrozoa
B. Scyphozoa
C. Actinozoa
D. All of the above
Answer: Actinozoa