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Compact discs mainly use ________

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Compact discs mainly use ________

(a) optical recording

(b) magnetic recording

(c) magnetic retrieval

(d) both optical and magnetic recording

This question was addressed to me in a job interview.

The above asked question is from Envelope Detector in chapter Amplitude Modulation of Analog Communications

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The correct choice is (a) optical recording

For explanation I would say: Compact disk (CD) is mainly used for storage of data. It was developed only for store and play only audio but was later adapted for storage of data also. It mainly used optical recording and retrieval.

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