Multiple choice

A modem performs _________

  1. modulation

  2. demodulation

  3. data compression

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Modems perform modulation (converting digital signals to analog for transmission), demodulation (converting received analog signals back to digital), and often include data compression to improve throughput efficiency. All three functions are core modem operations, making 'all of these' the comprehensive answer.

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