Which component is part of the system unit?

The keyboard is an external input device used for entering data into the computer. While it is essential for user interaction, the keyboard is not physically housed within the system unit but instead connects externally for input purposes.

A printer is an output device used to produce physical copies of documents or images created on the computer. Unlike internal components like the motherboard, the printer is a separate peripheral device that connects to the computer but is not contained within the system unit.

The monitor, or display screen, is an output device that visually presents information processed by the computer. It provides a visual interface for users to interact with software and view output. Like the printer, the monitor is an external device that connects to the system unit but is not a part of it internally.