Assertion: The duck-billed Platypus and the spiny ant-eater, both are egg-laying animals yet they are grouped under mammals.

Reason: Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

(c) If Assertion is correct but Reason is incorrect.

(d) If both the Assertion and Reason are incorrect.