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

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

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Operating System (OS)
Thrashing

always occurs on large computers
None of these
can always be avoided by swapping
can be caused by poor paging algorithms
is a natural consequence of virtual memory systems

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