Operating System (OS)
Trojan-Horse programs

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

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Operating System (OS)
The instruction register

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

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Operating System (OS)
Multiprogramming

allows multiple programs to reside in separate areas of core at the time.
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
is a method of allocating processor time.
None of these

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