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In QAM, the amplitude is _______ and phase is _______

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In QAM, the amplitude is _______ and phase is _______

(a) Varied, constant

(b) Varied, varied

(c) Constant, varied

(d) Constant, constant

I got this question in an online quiz.

My query is from Combined Linear and Constant Envelope Modulation Techniques in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct option is (b) Varied, varied

Explanation: Quadrature amplitude modulation (QAM) is obtained by allowing the amplitude to also vary with the phase. Thus, the constellation consists of square lattice of signal points.

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