11. If a body on which three forces are acting is in equilibrium which of the following-can
be correctly inferred?
I. The vector sum of the three forces is zero
II. Two of the forces act in the same direction
III. Each of the forces has the same magnitude
(A) I only
(B) III only
(C) I and II only
(D) II and III only
(E) I, II, and III