Operating System (OS)
The instruction register

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.
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".

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Operating System (OS)
Daisy chain is a device for

None of these
All of these
interconnecting a number of devices to a number of controllers
connecting a number of devices to a controller
connecting a number of controllers to a device

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