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Which of the following operating system does not implement the multitasking truly?

Which of the following operating system does not implement the multitasking truly? Correct Answer MS DOS

Multitasking, in an operating system, is allowing a user to perform more than one computer task (such as the operation of an application program) at a time. The operating system is able to keep track of where you are in these tasks and go from one to the other without losing information.
MS DOS does not implement the multitasking.

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