Operating System (OS)
Data encryption

is not necessary, since data cannot be intercepted
is mostly used by public networks
None of these
is mostly used by financial networks
cannot be used by private installations

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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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