A kilobyte is bytes.

In the decimal system used for standard data-size prefixes, “kilo” means 1,000. So a kilobyte is 1,000 bytes, making “1,000” the correct choice. In some computing contexts, a kilobyte is used informally to mean 1,024 bytes, but that value is not among the choices; the precise term for 1,024 bytes is a kibibyte.

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