The correct answer is Monitor.The monitor is an output device.Input Device: A piece of equipment/hardware that helps us enter data into a computer is called an input device.For example keyboard, mouse, Light Pen, etc. Output Device: A piece of equipment/hardware that gives out the result of the entered input, once it is processed (i.e. converts data from machine language to a human-understandable language).For example printers, monitors, etc. A monitor is also referred to as a VDT (video display terminal) and VDU (video display unit), a monitor is an output device that displays video images and text.A monitor is made up of circuitry, a screen, a power supply, buttons to adjust screen settings, and a casing that holds all of these components.Like most early TVs, the first computer monitors were comprised of a CRT (cathode ray tube) and a fluorescent screen.Today, all monitors are created using flat panel display technology, usually backlit with LEDs (light-emitting diode). Additional InformationKeyboardThe keyboard is a basic input device that is used to enter data into a computer or any other electronic device by pressing keys.It has different sets of keys for letters, numbers, characters, and functions.Keyboards are connected to a computer through USB or a Bluetooth device for wireless communication.The three types of keyboards are QWERTY, AWERTY, and DVORAK.MouseA mouse is a small handheld input device that controls a computer screen's cursor or pointer in conjunction with the way it is moved on a flat surface. The mouse term name originates from its likeness to a small, corded, and elliptical-shaped device that looks like a mouse tail. A mouse is device that have integrated features, such as extra buttons that may be programmed and assigned with different commands.The mouse was invented in 1963 by Douglas C. Engelbart from Stanford and later pioneered in 1981 by the Xerox Corporation.Modern mouse devices use optical technology, where cursor movements are controlled by a visible or invisible light beam. Light PenA light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display.It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.