Operating System (OS)
Feed back queue

are used to favor real-time tasks
None of these
are very easy to implement
require manual intervention to implement properly
dispatch tasks according to execution characteristics

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

assigning ready process to the CPU
None of these
suspending some of the processes when the CPU load is high
swapping a process to the disk
bring processes from the disk to the main memory

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Operating System (OS)
Trojan-Horse programs

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

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