Operating System (OS)
System maintenance:

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

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Operating System (OS)
A page fault

is an error is a specific page
is an access to a page not currently in memory
None of these
occurs when a program accesses a page of memory
is a reference to a page belonging to another program

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