Operating System (OS)
The instruction register

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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Operating System (OS)
Trojan-Horse programs

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

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