Q. Angle of action of cam is defined as the angle

• (A) Of rotation of the cam for a definite displacement of the follower
• (B) Through which the cam rotates during the period in which the follower remains in the highest position
• (C) Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
• (D) Moved by the cam from beginning of ascent to the termination of descent