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If the three phase supply is fed to the rotor and it is running at its normal operating conditions. Then the synchronous speed can be defined as speed at which?

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If the three phase supply is fed to the rotor and it is running at its normal operating conditions. Then the synchronous speed can be defined as speed at which?

(a) stator magnetic field rotates

(b) rotor magnetic field rotates

(c) rotor rotates

(d) flux is set up in the rotor

This question was posed to me during an online exam.

The origin of the question is Rotor EMF, Current and Power in section Induction Machines of Electrical Machines

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The correct answer is (b) rotor magnetic field rotates

For explanation: If it is fed from rotor then the synchronous speed is also w.r.t. rotor.

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