Final answer:
The correct answer is A. Light Pen. A light pen is a type of computer input device that allows users to point directly at objects or draw on the screen by pressing the pen's button.
Step-by-step explanation:
The correct answer is A. Light Pen. A light pen is a type of computer input device that allows users to point directly at objects or draw on the screen by pressing the pen's button. It works by emitting a light beam and detecting the reflection when it touches the screen.
A plotter (option B) is an output device used to produce high-quality graphics, while a printer (option C) is also an output device used to print text and images on paper. A speaker (option D) is an output device used to produce sound.