Consider the following for a variable reluctance stepper motor used in control system.
1. The static torque acting on the rotor is a function of angular misalignment between stator and rotor teeth.
2. There are two positions of zero torque: \(\theta=0^{\circ}\) and \(180^{\circ} / \mathrm{T}\) ( \(\mathrm{T}=\) number of rotor teeth).
3. Both zero torque positions are stable.
4. As the stator is excited, the rotor is pulled into the nearest minimum reluctance position.
Of these statements
(a) 2, 3 and 4 are correct
(b) 1, 2 and 3 are correct
(c) 1, 2 and 4 are correct
(d) 1, 3 and 4 are correct.