Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage
None of these
a single program is processed by two or more CPUs
interprogram interference may occur

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Operating System (OS)
A page fault

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

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