Operating System (OS)
The Memory Address Register

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".
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

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Operating System (OS)
A Processor

is a sequence of instructions
is a device that performs a sequence of operations specified by instructions in memory.
is the device where information is stored
None of these
is typically characterized by interactive processing and time of the CPU

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