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)
Fork is

increasing the priority of a task
the dispatching of a task
the creation of a new job
the creation of a new process
None of these

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