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Which of the following is true about class D amplifier?

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Which of the following is true about class D amplifier?

(a) Its efficiency is very less

(b) It can be made to work as bulb

(c) It is big in size

(d) It operates on lesser frequently

The question was asked in an online interview.

This is a very interesting question from Class D Amplifiers in section Power Amplifiers of Electronic Devices & Circuits

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The correct answer is (d) It operates on lesser frequently

The best explanation: class D amplifier work by generating a square wave of which the low frequency portions of the spectrum is essentially the wanted output signal.

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