Operating System (OS)
Under virtual storage,

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

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Operating System (OS)
Scheduling is

the same regard-less of the purpose of the system
not required in uniprocessor systems
None of these
unrelated to performance consideration
allowing jobs to use the processor

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