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 processing is much faster than would other-wise be the case when user defined commands are used
users can create system programs and run them as commands
None of these
the command set being common across different hardware configurations

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Operating System (OS)
File record length

None of these
depends upon the size of the file
Should always be variable
should be chosen to match the data characteristics
should always be fixed

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