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Which of the following provides an illusion of multitasking?

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Which of the following provides an illusion of multitasking?

(a) single task operating system

(b) multitasking operating system

(c) cooperative multitasking

(d) pre-emption

The question was posed to me during an interview for a job.

Question is from Task Swapping Methods topic in section Real Time Operating systems of Embedded Systems

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Correct choice is (c) cooperative multitasking

Easy explanation: The cooperative multitasking co-operates between them which provides the illusion of multitasking. This is done by periodically executing the tasks.

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