Operating System (OS)
Thrashing can be avoided if

None of these
the speed of CPU is increased
the pages, belonging to the working set of the programs, are in main memory
All of these
the speed of I/O processor is increased

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Operating System (OS)
Semaphores

synchronize critical resources to prevent deadlock
synchronize critical resources to prevent contention
are used to do I/O
None of these
are used for memory management

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