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

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

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Operating System (OS)
Swapping

does not work with overlaying
allows each program in turn to use the memory
works best with many small partitions
allows many programs to use memory simultaneously
None of these

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