Concept:An output device displays or sends processed data from the computer to the user in a human-readable form.
Explanation:A monitor is the correct example of an output device.
It takes data from the computer and displays it visually on the screen.
Other output devices include printer, projector, plotter, speaker, and headphones.
A keyboard, scanner, and joystick are input devices because they send data to the computer.
The keyboard is used for typing, the scanner for digitizing documents, and the joystick for gaming controls.
Therefore, among the given options, only the monitor works as an output device.
Answer:Monitor