Operating System (OS)
Virtual Memory

None of these
allows multiple programs to reside in separate areas of core at the time.
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.
is a method of allocating processor time.

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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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