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

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

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Operating System (OS)
System maintenance:

None of these
is usually not necessary
is necessary on all systems, regardless of how good
always requires several programs
is not required if the system is well written

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