Operating System (OS)
The Memory Address Register

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

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Operating System (OS)
The FIFO algorithm

execute first the job that has been in the queue the longest
executes first the job with the least processor needs
None of these
executes first the job that last entered the queue
executes first the job that first entered the queue

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