Operating System (OS)
Semaphores

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

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Operating System (OS)
The FIFO algorithm

executes first the job with the least processor needs
execute first the job that has been in the queue the longest
None of these
executes first the job that first entered the queue
executes first the job that last entered the queue

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