Which one of the following is an incorrect statement regarding mitochondrial $ETC$ and oxidative phosphorylation?

• A
  Enzyme complex $I$ accepts electrons and $H^+$ from $NADH$ and $FADH_2$.
• B
  Passage of protons through the channel is coupled to the catalytic site of the $F_1$ for $ATP$ production.
• C
  Cytochrome-$c$ is a mobile protein attached to the outer surface of the inner membrane.
• D
  $6 H^+$ passes through $F_0$ from the intermembrane space to the matrix down the electrochemical proton gradient to produce $3 ATP$.