A piece of plywood in which several holes are being drilled successively has been secured...

A piece of plywood in which several holes are being drilled successively has been secured to a workbench by means of two nails. Knowing that the drill exerts a 12 N ·m couple on the piece of plywood, determine the magnitude of the resulting forces applied to the nails if they are located  (a)  at A and B. (b) at B and C,  (c)    at A and C.