Operating System (OS)
System generation:

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

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Operating System (OS)
Under virtual storage,

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

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