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

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.
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.
None of these

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Operating System (OS)
Trojan-Horse programs

are hidden programs that do not show up on the system
usually are immediately discovered
None of these
are legitimate programs that allow unauthorized access
do not usually work

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