Operating System (OS)
Semaphores

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

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

All of these
Fewer people, less management and shorter transition in learning time
Improved debugging capability, and superior documentation
A greater degree of machine independence
None of these

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