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What does USB stand for?

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What does USB stand for?

(a) Universal Signal Board

(b) Universal Signal Bus

(c) Universal Serial Bus

(d) Universal Serial Board

I have been asked this question during an online interview.

The above asked question is from Memory Storage Devices in division Secondary Storage Devices of Computer Fundamentals

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The correct choice is (c) Universal Serial Bus

To explain: USB stands for universal serial bus. A flash drive simply plugs in the USB port of a computer.

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