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Which statement is true about Square Law modulators?

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Which statement is true about Square Law modulators?

(a) it is used for frequency modulation

(b) it is used for pulse width modulation

(c) it is used for amplitude modulation

(d) it is used for phase modulation

I have been asked this question in unit test.

This intriguing question originated from Pre Emphasis and De Emphasis in division Receivers & Transducers of Analog Communications

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The correct answer is (c) it is used for amplitude modulation

Explanation: In amplitude modulation, the amplitude of the carrier wave is varied with respect to the instantaneous amplitude of the wave to be transmitted. Square Law modulators are generally used for generation of amplitude modulation. They have nonlinear current-voltage characteristics. They are highly nonlinear in low voltage region.

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