Given below are two statements regarding evolution.
$Statement-I$: Selection against harmful mutation leads to a mutation balance.
$Statement-II$: In mutation balance, the allele frequency of harmful recessives keep on changing generation after generation.
In the light of above statements, choose the most appropriate answer from the options given below:

• A
  $Statement-I$ is correct but $Statement-II$ is incorrect.
• B
  Both $Statement-I$ and $Statement-II$ are correct.
• C
  Both $Statement-I$ and $Statement-II$ are incorrect.
• D
  $Statement-I$ is incorrect but $Statement-II$ is correct.