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1 . Which one works as both an output and input device ?

A. Modem
B. Scanner
C. Mouse
D. Monitor

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Answer: Option A

Explanation:

A modulator - demodulator, or simply a modem, is a hardware device that converts data from a digital format, intended for communication directly between devices with specialized wiring, into one suitable for a transmission medium such as telephone lines or radio.

A modem modulates one or more carrier wave signals to encode digital information for transmission, and demodulates signals to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded reliably to reproduce the original digital data.

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