Operating System (OS)
System maintenance:

is usually not necessary
None of these
always requires several programs
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)
The function(s) of the Storage Assignment is (are)

to assign storage to all temporary locations that are necessary for intermediate results.
All of these
to assign storage to literals, and to ensure that the storage is allocate and appropriate locations are initialized.
to assign storage to all variables referenced in the source program.
None of these

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