Operating System (OS)
System generation:

None of these
varies in difficulty between systems
is always quite simple
requires extensive tools to be understandable
is always very difficult

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Operating System (OS)
Under virtual 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
only the active pages of a program are stored in primary storage

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