Operating System (OS)
The Memory Address Register

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

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

Fewer people, less management and shorter transition in learning time
All of these
None of these
A greater degree of machine independence
Improved debugging capability, and superior documentation

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