Operating System (OS)
The working set theory of programming behaviour of processes running within an operating system involves

None of these
disk scheduling mechanisms
assigning the CPU to processes
the collection of pages that a process accesses
coalescing holes in memory

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Operating System (OS)
A critical region is

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

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