Operating System (OS)
System maintenance:

is usually not necessary
always requires several programs
is not required if the system is well written
is necessary on all systems, regardless of how good
None of these

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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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