Operating System (OS)
Trojan-Horse programs

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

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

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

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Operating System (OS)
The function(s) of file system is (are):

All of these
to provide complete file naming freedom to the users and to permit controlled sharing of files
to provide security against loss of information due to system failure
None of these
to provide for long and short term storage of files with appropriate economic tradeoffs.

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Operating System (OS)
Multiprogramming systems:

execute each job faster
are easier to develop than single programming system
are used only on large mainframe computers
execute more jobs in the same time period
None of these

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