Operating System (OS)
Trojan-Horse programs

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

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

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 hardware memory device which denotes the location of the current instruction being executed.
None of these
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.

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