Which one of the following is not an output device ?

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Which one of the following is not an output device ?

Printer
Speaker
Plotter
Optical Mouse
This question was previously asked in
UPSC CISF-AC-EXE – 2018
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An Optical Mouse is an input device.
– Output devices receive data from a computer and present it in a human-readable form (visual, audio, physical print, etc.). Examples include printers, speakers, and plotters.
– Input devices send data and control signals to a computer. Examples include keyboards, mice, scanners, and microphones.
– An optical mouse detects movement and clicks, sending this information as input to the computer.
Printers create hard copies of digital documents. Speakers produce sound output. Plotters are used for drawing vector graphics, typically large-scale technical drawings.

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