A cylinder rolls up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions). The directions of the frictional force acting on the cylinder are.

Options

A. up the incline while ascending and down the incline descending.
B. up the incline while ascending as well as
descending.
C. down the incline while ascending and up
the incline while descending.
D. down the incline while ascending as well as
descending.