Operating System (OS)
Data encryption

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

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Operating System (OS)
Virtual Memory

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

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