A rigid planar wire loop carrying a steady current is placed in a uniform magnetic field \(\vec{B}\) and is free to rotate about a fixed axis perpendicular to the field lines. The orientation of the loop is described by the angle \(\theta\) between its magnetic dipole moment \(\vec{\mu}\) and the magnetic field \(\vec{B}\), over the full rotation from \(\theta = 0^\circ\) to \(\theta = 360^\circ\). Which of the following correctly describes the qualitative graph of the net magnetic torque \(\tau\) exerted on the loop as a function of \(\theta\), and correctly identifies the stability of the equilibrium at \(\theta = 180^\circ\)?