When a CPU fetches an instruction word from memory, the word contains an operation code (op code) that indicates the type of operation the CPU is to perform and information specifying where the instruction operands are located. A computer may use various addressing modes to specify the operand location. One such addressing mode is shown below, where R designates some register within the CPU and d is a constant embedded in the instruction word
Which of the following terms best describes the addressing mode used by the instruction above?
A. Immediate addressing
B. Direct addressing
C. Indexed addressing
D. Indirect addressing