The correct answer is: A. Keyboard
A keyboard is an input device that allows a user to input text into a computer or other electronic device. It is one of the most common input devices, and is used for a variety of tasks, such as typing text, entering commands, and playing games.
A terminal is a computer that is connected to another computer, usually a mainframe or server. Terminals are
used to enter data into the mainframe or server, and to display output from the mainframe or server.A printer is an output device that prints text or images onto paper. Printers are used to produce hard copies of documents, such as letters, reports, and presentations.
A plotter is an output device that draws images onto paper. Plotters are used to produce high-quality drawings, such as blueprints and maps.
E. None of the above is not the correct answer, as a keyboard is an input/output device at which data enters or leaves a computer system.