Which of the following statements are correct?
I. A body can have zero velocity and still be accelerated
II. A body can have a constant velocity and still have a varying speed
III. A body can have a constant speed and still have a varying velocity
IV. The direction of the velocity of a body cannot change when its acceleration is constant.
(a) I and II
(b) I and III
(c) I, II and III
(d) II, III and IV
