Operating System (OS)
Multi programming systems ......

Execute each job faster
Are easier to develop than single programming system
Are used only by large mainframe computer
Execute more jobs in the same time period

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Operating System (OS)
Under virtual storage,

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

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