which of the following statements are correct.

Options

A. friction acting on a cylinder without sliding on an inclined surface is always upward along the incline surface is always upward along the incline irrespective of any external force acting on it.
B. friction acting on a cylinder without sliding on an inclined surface is may be upwards may be downwards depending on the external force acting on it.
C. friction acting on cylinder rolling without sliding may be zero depending on the external force acting on it.
D. nothing can be said exactely about it as it depends on the friction coefficient on inclined plane.

Answer

B, C

Explanation

the direction of the friciton depends on the diraction of net external force acting on the body