Operating System (OS)
The Register - to - Register (RR) instructions

None of these
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
have both their operands in the main store.

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

users can create system programs and run them as commands
the processing is much faster than would other-wise be the case when user defined commands are used
the command set being common across different hardware configurations
None of these
flexibility to the users in running lists of commands by simply collecting them in named batch command files

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