Operating System (OS)
Multiprogramming systems:

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

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Operating System (OS)
Trojan-Horse programs

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
do not usually work

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Operating System (OS)
Scheduling is

None of these
the same regard-less of the purpose of the system
not required in uniprocessor systems
allowing jobs to use the processor
unrelated to performance consideration

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