The moment of a force

A$.$is the turning effect produced by a force, on the body, on which it acts

B$.$is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

C$.$is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

D$.$all of the above