On a Correctly Fitted Bike, When the Pedal Cranks Are

On a correctly fitted bike, when the pedal cranks are parallel with the ground, the participant's knee should be:

A) Slightly in front of the pedal, so that when they look down they can't see their foot.
B) Slightly behind the pedal, so the participant can see the pedal.
C) Directly over the pedal, so the participant can only see his or her toes.
D) It doesn't matter; you measure correct fit only when the pedal cranks are perpendicular to the ground.