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

None of these
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
the command set being common across different hardware configurations

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Operating System (OS)
Multiprogramming

is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
is a method of allocating processor time.
allows multiple programs to reside in separate areas of core at the time.
None of these
consists of those addresses that may be generated by a processor during execution of a computation.

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