4.) Draw a schematic the entire circuit, labeling the inputs and outputs. (Replace the circuit for Question 1 with a simple XOR gate.) 1.) The formula for the lowest output bit (SO) is: AO XOR BO. Design a circuit to perform this function, labeling the inputs as AO and B0, and the output as so. Draw the schematic for this circuit. (You may use AND, OR, and NOT gates - but not XOR gates - for this step.)