A.The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link
B.The direction of relative velocity vector for the two coincidental points rotated by 180? in the direction of the angular velocity of the rotation of the link
C.The direction of relative velocity vector for the two coincidental points in the direction directly opposite to that of angular velocity
D.The direction at right angles to that of relative angular velocity vector
E.None of the above