Operating System (OS)
Daisy chain is a device for

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

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Operating System (OS)
The Memory Address 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
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".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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