The instruction register
  • 1is a hardware memory device which denotes the location of the current instruction being executed.
  • 2is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
  • 3contains the address of the memory location that is to be read from or stored into.
  • 4contains 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".
Answer:- 1
Explanation:-

Solution:
The instruction register is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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