The instruction register

• A. is a hardware memory device which denotes the location of the current instruction being executed.
• B. is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
• C. contains the address of the memory location that is to be read from or stored into.
• D. 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".