Given below are two statements.
Statement-$I$: Cytochrome $c$ is a small, copper-containing protein loosely attached to the inner membrane.
Statement-$II$: Cytochrome $c$ acts as a mobile electron carrier transferring electrons between complex $I$, $II$, and $IV$.
In the light of the above statements, choose the correct 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.