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

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

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Operating System (OS)
The Memory Address Register

is a hardware memory device which denotes the location of the current instruction being executed.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains the address of the memory location that is to be read from or stored into.

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