Input devices are used to enter data and instructions into a computer, while output devices present processed results to users. A keyboard is a classic example of an input device because it allows users to type commands and text. A monitor displays information visually, functioning as a standard output device. Hence, this pair correctly reflects the input-output distinction.
Option A:
This option reverses the functions of the printer and scanner. A printer produces hard-copy output from digital data, so it is an output device. A scanner converts physical documents into digital form, making it an input device. Since the roles are interchanged, the option is incorrect.
Option B:
This option labels the mouse as an output device, although it is clearly an input device that sends user commands to the computer. Similarly, speakers play sound output generated by the system and are not used for input. Thus, both components are misclassified.
Option C:
This option treats the microphone as an output device and the plotter as an input device. In reality, a microphone captures audio signals from the user, so it is an input device. A plotter draws vector graphics on paper, serving as an output device. The pair is therefore incorrect.
Option D:
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