Operating System (OS)
Memory management is :

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

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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
swapping a process to the disk
bring processes from the disk to the main memory
assigning ready process to the CPU
None of these

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