Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrates. Reason (R) : Notochord is replaced by vertebral column in the adult vertebrates. In the light of the above statements, choose the most appropriate answer from the option given below :

1. A. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2. B. (A) is correct but (R) is not correct
3. C. (A) is not correct but (R) is correct
4. D. Both (A) and (R) are correct and (R) is the correct explanation of (A)

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