Operating System (OS)
The virtual memory is

An extremely large main memory
A type of memory used in super computer
An illusion of extremely large main memory
An extremely large secondary memory

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Operating System (OS)
Under virtual storage,

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

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