In the figure below, A and B are 1-bit registers, DATA is 1-bit input, MUX is 2-to 1 multiplexer, Adder performs adder/subtracter operations based on input of carry bit (assume no overflow would happen). Shift is a shifter that takes an input and shifts it left (L/R - 0) or right (L/R-1) for 1-bit respectively. There are 8 possible input combinations with 3 selector inputs. For each combination of S,S, So, describe what this circuit does