Which of them is not a multi-user operating system?

UNIX

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Windows NT

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PC-DOS

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All the above

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Solution

The correct option is D PC-DOS
PC-DOS is not a multi-user operating system because PC-DOS is single user operating system.

PC-DOS (Personal Computer - Disk Operating System) was the first widely-installed operating system used in personal computers. It was developed for IBM by Bill Gates.

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