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Which of the following is not the method of auxiliary commutation?

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Which of the following is not the method of auxiliary commutation?

(a) Voltage commutation

(b) Resistance commutation

(c) Current commutation

(d) Load commutation

I had been asked this question at a job interview.

This interesting question is from DC Motor Control Through Choppers in section Motor Control by Static Power Converters of DC Machines

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Correct choice is (b) Resistance commutation

Best explanation: Thyristor in a chopper has to be turned off by auxiliary commutation. This can be done by two methods-Forced commutation and Load commutation. Forced commutation can also be done by two ways, current and voltage.

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