Operating System (OS)
System maintenance:

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

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Operating System (OS)
Round-robin scheduling

is quite complex to implement
allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor
None of these
gives each task the same chance at the processor

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