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

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".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
None of these

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Operating System (OS)
The term "operating system" means

None of these
conversion of high level language into machine code
the way a computer operator works
the way a floppy disk drive operates
a set of programs which controls computer working

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