please solve all of them.

xercises A3 B3 C3 A2 B2 C2 A1 B1 C1 A0 BO co Carry-in Carry-in Carry-in Carry-in S3 S2 S1 So Figure 3.39 Diagram for Exercise 3.24 3.24 a. Figure 3.39 shows a logic circuit that appears in many of today's processors. Each of the boxes is a full-adder circuit. What does the value on the wire X do? That is, what is the difference in the output of this circuit if X = 0 versus if X = 1? b. Construct a logic diagram that implements an adder/subtracter. That is, the logic circuit will compute A + B or A B depending on the valuc of X. Hint: Use the logic diagram of Figure 3.39 asa building block