Operating System (OS)
Thrashing can be avoided if

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

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Operating System (OS)
Semaphores

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

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