Design a 4-bit 2's complement addition/ subtraction circuit using Full Adders as the building blocks and some basic logic gates (AND, OR, NOT, XOR). The adder has 9 inputs: 4 inputs corresponding to each 4-bit numbers A and B (where A=A3A2A1A0 and B=B3B2B1B0 ), and one control signal C. When C=0, the adder performs the addition (A+B). When C=1, the adder performs the subtraction operation (AB). The adder has 5 outputs: 4 outputs corresponding to the 4-bit result bits (S=S3S2S1S2), and the fifth output (OF) indicates the overflow condition after the addition/ subtraction process. Your design should use minimum possible number of Full Adder blocks and basic logic gates. Draw a clear diagram showing all the important inputs/ outputs/signals and building blocks