Operating System (OS)
The Memory Address Register

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

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Operating System (OS)
A spooler is a

Location in memory that maintains the contents of documents until it prints
Queue of print job that are waiting to print
Message sent from the printer to the operating system when a print job is completed
Program that coordinates the print job that are waiting to process

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