Operating System (OS)
The dispatcher

is always small and simple
None of these
actually schedules the tasks into the processor
puts tasks in I/O wait
never changes task priorities

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Operating System (OS)
Trojan-Horse programs

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

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Operating System (OS)
The Memory Address Register

contains the address of the memory location that is to be read from or stored into.
None of these
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".

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