Using two 4-bit registers R1 and R2, a 4-bit adder, a 2-to-1 multiplexer, and a 4-to-1 mul...

Using two 4-bit registers R1 and R2, a 4-bit adder, a 2-to-1 multiplexer, and a 4-to-1 multiplexer, construct a circuit that implements the following operations under the control of the three multiplexer select inputs and the adder’s carry-in input: