Q. If three coplanar forces acting at origin are in equilibrium then which is correct:


$$\begin{gathered} A. F_1-F_2=\frac{F_3}{\sqrt{2}} \\ B. F_1-F_2=\sqrt{\frac{2}{3}}{F}_3 \\ C. F_1+F_3=\sqrt{2}{F}_2 \\ D. F_1-F_3=\frac{2}{\sqrt{3}}{F}_2 \end{gathered}$$