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Which are the methods for getting an ideal commutation?

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Which are the methods for getting an ideal commutation?

(a) Resistance commutation

(b) Voltage commutation

(c) Current commutation

(d) Resistance and voltage commutation

The question was posed to me during an interview for a job.

Question is taken from Commutation Process -1 in chapter Commutation Process & Excitation Methods of DC Machines

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Correct option is (d) Resistance and voltage commutation

Best explanation: Adding resistance between commutator segments and brushes, thus, reducing L/R and consequently getting faster commutation is one of the method. In voltage commutation we, introduce narrow poles called as interpoles to fasten the process.

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