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Which layer performs adaptive modulation and coding?

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Which layer performs adaptive modulation and coding?

(a) Network layer

(b) Transport layer

(c) Physical layer

(d) Data link layer

I had been asked this question in an online quiz.

I'm obligated to ask this question of Next Generation Wireless Network topic in chapter Next Generation Wireless Network of Cognitive Radio

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Correct option is (c) Physical layer

To explain I would say: Adaptive modulation and coding is the process of adjusting signal parameters such as the modulation type, coding technique, and protocol parameters to the characteristics of the channel selected for transmission. The adaptive modulation system requires channel state information at the transmitter.

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