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

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
users can create system programs and run them as commands

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Operating System (OS)
Thrashing can be avoided if

None of these
All of these
the speed of CPU is increased
the speed of I/O processor is increased
the pages, belonging to the working set of the programs, are in main memory

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