Consider the internal structure of a CPU consisting of a program counter (PC), instruction register (IR), memory address register (MAR), memory buffer register (MBR), accumulator (AC), arithmetic and logic unit (ALU), control unit, and 3 additional registers X, Y, and Z (temporary storage). Write the sequence of micro- operations required to add a number to the AC when the number is

(i) an immediate operand.

(ii) a direct-address operand.