An input/output device at which data enters or leaves a computer system is
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Answer: B) Terminal
A terminal is an input/output device used to enter data into a computer system and receive output from it. A typical terminal consists of a keyboard and a display screen.
Exam Tip: A terminal can perform both input and output functions, whereas a keyboard is primarily an input device and a printer is an output device.
Source: Scan #36 page 15 Q490