Operating System (OS)
A Processor

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

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

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".
contains the address of the memory location that is to be read from or stored into.
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.

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