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

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

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Operating System (OS)
The LRU algorithm

pages out pages that have been least used recently
pages out the first page in a given area
pages out pages that have not been used recently
None of these
pages out pages that have been used recently

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