In terms of inputs a and b, explain in English what the output of the upper AND gate will be. In terms of inputs a and b, explain in English what the output of the lower AND gate will be. What kind of gate is shown marked by a plus sign in figure 4.2.7? In terms of inputs a and b, explain in English what the output of the circuit in figure 4.27 will be FIGURE 4.27 1-CE Circuit Output One-bilt compare-for-equality circuit