Operating System (OS)
Daisy chain is a device for

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

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Operating System (OS)
The instruction register

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.
None of these
contains the address of the memory location that is to be read from or stored into.
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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