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

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Operating System (OS)
Memory management is :

critical for even the simplest operating systems
not used on multiprogramming systems
None of these
not used in modern operating system
replaced with virtual memory on current systems

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