Correct Answer:
C. Scanner
The question asks to identify which device is NOT an output device. An output device receives data from a computer and displays or presents it to the user. Scanner is the correct answer because it is an input device. A scanner captures images, text, or objects from the physical world and converts them into digital data that the computer can process and store. It sends information *into* the computer.
- Projector (A) is an output device that displays images or video onto a screen or surface.
- Plotter (B) is an output device used for printing vector graphics, often on large sheets of paper, typically for architectural or engineering designs.
- Monitor (D) is an output device that visually displays information processed by the computer to the user.