Q.

According to principle of moments

• AIf a system of coplanar forces is in equilibrium, then their algebraic sum is zero
• BIf a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
• CThe algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point
• DPositive and negative couples can be balanced