Operating System (OS)
The instruction register

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.
None of these
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
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".

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Operating System (OS)
Memory

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

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