A uniform horizontal scaffold of mass \(M\) and length \(L\) is attached to a vertical wall by a pivot at the left end (\(x = 0\)) and supported by a vertical cable at the right end (\(x = L\)). A worker of mass \(m\) walks slowly along the scaffold from \(x = 0\) to \(x = L\). Which graph best represents the magnitude of the vertical force \(F_{\text{pivot}}\) exerted by the pivot on the scaffold as a function of the worker's position \(x\)?