A uniform disk of mass \(M\) and radius \(R\) is mounted on a horizontal, frictionless axle that passes through a point \(P\) located a distance \(\dfrac{R}{2}\) from the center of the disk. The disk is held in a position such that the center of the disk and the axle are at the same horizontal level, as shown in the figure. At the moment the disk is released from rest, which of the following correctly describes the torque about the axle and the magnitude of the upward vertical force \(F_{axle}\) exerted by the axle on the disk?