Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?Select one:a. the second at the doorknobb. both exert zero torquesc. both exert zero torquesd. the first at the midpointe. both exert equal non-zero torques