Operating System (OS)
The most common security failure is

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

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

None of these
the command set being common across different hardware configurations
users can create system programs and run them as commands
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

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