Which of the following does not represent an I/O device? (a) Speaker (b) Plotter (c) Joystick (d) CU -Technology

Which of the following does not represent an I/O device? (a) Speaker (b) Plotter (c) Joystick (d) CU -Technology
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Answer :

(d) CU is used to co-ordinate the input and the output devices of a computer system.
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