Operating System (OS)
The Memory Buffer Register (MBR)

is a hardware memory device which denotes the location of the current instruction being executed.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
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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Operating System (OS)
A Processor

is typically characterized by interactive processing and time of the CPU
None of these
is the device where information is stored
is a sequence of instructions
is a device that performs a sequence of operations specified by instructions in memory.

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