I/O stands for what in computing?

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I/O in computing refers to the movement of data between a computer and its environment. It captures the two directions of data flow: input, which brings data into the system, and output, which sends data out. The best answer uses the full terms that describe these two directions: Input and Output. The slash form Input/Output is also common, but the option that spells out the two words matches the intended meaning. The other choices don’t relate to data movement in computing.