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

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

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Operating System (OS)
The dispatcher

actually schedules the tasks into the processor
is always small and simple
puts tasks in I/O wait
None of these
never changes task priorities

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