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What type of multiplexing is used in mobile phones?

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What type of multiplexing is used in mobile phones?

(a) Frequency division multiplexing

(b) Time division multiplexing

(c) Code division multiplexing

(d) Phase multiplexing

I had been asked this question in class test.

Query is from Modulation and Multiplexing in portion Introduction to Electronic Communication of Avionics

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Correct choice is (c) Code division multiplexing

The explanation: In code-division multiplexing, the signals to be transmitted are converted to digital data that is then uniquely coded with a faster binary code. The signals modulate a carrier on the same frequency. All use the same communications channel simultaneously. The unique coding is used at the receiver to select the desired signal.

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