Operating System (OS)
System maintenance:

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

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Operating System (OS)
Multiprogramming

consists of those addresses that may be generated by a processor during execution of a computation.
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.
None of these
is a method of allocating processor time.
allows multiple programs to reside in separate areas of core at the time.

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