Operating System (OS)
The most common security failure is

too much emphasis on preventing physical access
carelessness by users
insufficient technology used to prevent breaches
depending on passwords
None of these

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Operating System (OS)
All of the following are task performed by the operating system except

Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer
Controlling the access that application program has to the CPU

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Operating System (OS)
Feed back queue

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

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