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

users can create system programs and run them as commands
the command set being common across different hardware configurations
flexibility to the users in running lists of commands by simply collecting them in named batch command files
None of these
the processing is much faster than would other-wise be the case when user defined commands are used

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Operating System (OS)
Data encryption

None of these
is mostly used by public networks
cannot be used by private installations
is mostly used by financial networks
is not necessary, since data cannot be intercepted

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