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) converts digital signals to analog for transmission over telephone lines (modulation) and converts received analog signals back to digital (demodulation). This bidirectional conversion enables digital devices to communicate over analog channels. Satellites, fiber optics, and coaxial cables are transmission media, not devices that perform modulation/demodulation.

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