The Register - to - Register (RR) instructions

• have both their operands in the main store.
• 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 written into the specified storage location.
• which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
• all of the above
• None of the above