Read the following statements:

$A.$ Variation at genetic level arises due to mutations.
$B.$ Technique of $DNA$ fingerprinting was initially developed by Alec Jeffreys

• A

  Only $(B)$ is correct

• B

  Both $(A)$ and $(B)$ are correct

• C

  Only $(A)$ is correct

• D

  Both $(A)$ and $(B)$ are incorrect