Operating System (OS)
Trojan-Horse programs

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

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Operating System (OS)
What is the method of handling deadlocks?

Allow the system to enter the deadlock state and then recover
All of these
Pretend that deadlocks never occur in the system
Use a protocol to ensure that the system will never enter a deadlock state

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Operating System (OS)
Backups should be done

daily for most installations
as several incrementals, followed by an image copy
as several image copies, followed by an incremental
None of these
weekly for most installations

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