Which of the following is not an output device

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Of the choices given, the monitor is used to receive information from the computer. Because of an input device is one which is used to pass on information to the computer, it is an output device.

Modem is both input as well as output device for sending and receiving data or information. When we look for purely input devices, we can go with keyboard. Because it can only used as input devices, so I pick keyboard which is not an output device.

Which of the following is not an output device

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