Operating System (OS)
Paging

is a method of allocating processor time.
allows multiple programs to reside in separate areas of core at the time.
None of these
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
consists of those addresses that may be generated by a processor during execution of a computation.

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Operating System (OS)
System maintenance:

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

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