Operating System (OS)
The Memory Address Register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
None of these
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".

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Operating System (OS)
System generation:

requires extensive tools to be understandable
is always very difficult
is always quite simple
varies in difficulty between systems
None of these

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