Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Generally, 3d transition metals have high melting points. Reason R: Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below:

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

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