Operating System (OS)
The SJF algorithm executes first the job

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

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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".
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.
None of these
is a hardware memory device which denotes the location of the current instruction being executed.

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