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

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

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Operating System (OS)
Operating system

None of these
provides a layered, user-friendly interface
enables the programmer to draw a flowchart
All of these
links a program with the subroutines it references

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