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

which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
have both their operands in the main store.
None 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

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Operating System (OS)
The term "operating system" means

conversion of high level language into machine code
the way a floppy disk drive operates
a set of programs which controls computer working
None of these
the way a computer operator works

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