Operating System (OS)
Under virtual storage,

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

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Operating System (OS)
A co-processor

Is quite common in modern computer
Is relatively easy to support in software
Works with any application
Causes all processor to function equally

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