Operating System (OS)
Trojan-Horse programs

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

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Operating System (OS)
Thrashing can be avoided if

All of these
None of these
the speed of CPU is increased
the pages, belonging to the working set of the programs, are in main memory
the speed of I/O processor is increased

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

the processing is much faster than would other-wise be the case when user defined commands are used
users can create system programs and run them as commands
flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations
None of these

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