Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

suspending some of the processes when the CPU load is high
None of these
assigning ready process to the CPU
bring processes from the disk to the main memory
swapping a process to the disk

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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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