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

flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations
users can create system programs and run them as commands
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)
A public key encryption system

None of these
does not encode the data before transmitting it
allows anyone to decode the transmission
allows only the correct receiver to decode the data
allows only the correct sender to decode the data

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