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  1. Which of the following is not an operating system?
    1. Multi user-Single tasking
    2. Single user- Single tasking
    3. Single user-Multitasking
    4. Multi user-Multitasking
Correct Option: A

A multi-user operating system allows multiple users to access a computer system at the same time. Although frequently associated with multiprogramming, multiuser operating system does, not imply multiprogramming or multitasking.



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