Operating System (OS)
What is the name of the technique in which the operating system of a computer executes several programs concurrently by switching back and forth between them?

None of these
Multitasking
Partitioning
Paging
Windowing

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Operating System (OS)
A critical region is

a program segment that often causes unexpected system crashes
none is the above
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
a program segment that has not been proved bug-free

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