Which of the following is not a part of a computer?

The answer is correct because the term "computer" refers to the entire system, while the other options (CPU, monitor, keyboard) are individual components that make up a computer. The CPU, or Central Processing Unit, is often considered the brain of the computer, responsible for processing instructions. The monitor displays visual output from the computer, and the keyboard is an input device used to enter data and commands. Since the question specifically asks for something that is not a part of a computer, identifying "computer" itself as the whole unit rather than a part clearly reflects its distinction from the other components.