B. 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 written into the specified storage location.
C. which perform indicated operations on two fast registers of the machine and have the result in one of the registers
Correct Answer: there is no need for an address i.e. the data is used as an address
9. In which addressing mode the effective address of the operand is the contents of a register specified in the instruction and after accessing the operand, the contents of this register is incremented to point to the next item in the list?