Consider the following statements about the working of a hysteresis motor and choose the suitable combination of correct choices.

a. The stator of the hysteresis motor has a main winding along with an auxiliary winding.

b. When the stator winding is fed from a single phase supply, it produces a synchronously revolving magnetic field.

c. The rotor material has low retentivity so hysteresis loss is low.

d. The rotor of the hysteresis motor consists of a smooth cylinder of magnetically hard steel, without winding