Operating System (OS)
The Storage-to-Storage instructions

which perform indicated operations on two fast registers of the machine and have the result in one of the registers
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, expect in the case of store operation when it is also
All of these
None of these
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
None of these
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

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