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 command set being common across different hardware configurations
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

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Operating System (OS)
Addressing structure

All of these
defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these

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