Operating System (OS)
An operating system is a program or a group of programs that

Helps in checking the spelling of Word
Performs the calculations of cells in Excel
Maintain the relationship in Database
Manages the resources of the Computer

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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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