9. For Figure 12.30,

(a) draw the implementation of a comparator, the circle with the equals sign. (Hint: Consider the truth table of an XOR followed by an inverter, sometimes called an XNOR gate.)

(b) Draw the input and output connections to and from the 128 four-input multiplexers.

(c) Draw the implementation of one of the 128 four-input multiplexers. You may use ellipses (. . .) in parts

(a) and

(b) of the exercise.