Explanation:

- Input: This refers to any data or instructions entered into the computer. Common devices for input are keyboards and mice.

- Monitor: A type of output device. It displays images and text to show users the results of processed data.

- Output: Refers broadly to any device that conveys data from a computer to a user. This includes monitors, printers, and speakers.

- Keyboard: An input device used to enter characters and functions into a computer system by pressing keys.

Output is the correct answer because it encompasses all devices that translate computer data into human-readable form.