Operating System (OS)
All of the following are task performed by the operating system except

Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation
Managing hardware on the computer
Provides an interface for user to interact with computer

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Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary 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

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