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Which of the following device was used in early TDM/PAM telemetry systems?

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Which of the following device was used in early TDM/PAM telemetry systems?

(a) Commuter

(b) Linear switch

(c) Logic gates

(d) DSP

This question was addressed to me in a job interview.

The doubt is from Time Division Multiplexing in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

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The correct choice is (a) Commuter

Easy explanation: Multiplexers in early TDM/PAM telemetry systems used a form of rotary switch known as a commutator. Multiple switch segments were attached to the various incoming signals while a high-speed brush rotated by a dc motor rapidly sampled the signals as it passed over the contacts.

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