Multiple choice

Which of the following performs modulation and demodulation?

  1. Modem

  2. Satellite

  3. Fiber optic

  4. Coaxial cable
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A Correct answer
Explanation

A modem (modulator-demodulator) performs both modulation (converting digital signals to analog for transmission) and demodulation (converting received analog signals back to digital). This enables digital data to be transmitted over analog communication lines like telephone wires. Satellites, fiber optics, and coaxial cables are transmission media but don't perform modulation/demodulation.

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