Which of the following statements is/are incorrect?
(i) A body moving with varying velocity may have constant speed.
(ii) If velocity of a body is varying, its speed must be varying.
(iii) A body moving with varying speed may have constant velocity if its direction of motion remains constant.
(iv) A body moving with varying speed may have constant velocity if it has zero acceleration.
A(ii) only
B(i) and (iii) only
C(ii), (iii) and (iv) only
D(i), (ii), (iii) and (iv)