When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is su....

When a bicycle is in motion, the force of friction
\( \mathrm{P} \)
exerted by the ground on the two wheels is such that it acts?
(1) in the backward direction on the front wheel and in the forward direction on the rear wheel
(2) in the forward direction on the front wheel and in the backward direction on the rear wheel
(3) in the backward direction on both the front and the rear wheels
(4) in the forward direction on both the front the rear wheels