Question 19N.1A.SL.TZ0.2

An object is held in equilibrium by three forces of magnitude F, G and H that act at a point in the same plane.

Three equations for these forces are

I.   F cos θ = G
II.  F = G cos θ + H sin θ
III. F = G + H

Which equations are correct?

A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III