Operating System (OS)
The most common security failure is

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

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
not used in modern operating system
not used on multiprogramming systems
None of these
critical for even the simplest operating systems

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Operating System (OS)
Scheduling is

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

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