A uniform rod of length \(L\) and mass \(M\) is attached to a vertical wall by a frictionless pivot. The rod is held at an angle \(\theta\) relative to the wall as shown. A string is attached to the free end of the rod and pulled with a constant tension \(T\). The string is oriented at an angle \(\phi\) above the horizontal. Which of the following expressions correctly represents the magnitude of the torque exerted by the string on the rod about the pivot?