9. A combinational circuit that receives 3 external inputs (x, y, and z where x is the MSB and z is the LSB). If the value of y is I then the output is the XOR of the three inputs. Otherwise (i.e. the value of y is 0) then the output is a copy of the value of x. The Boolean expression of the output of this circuit is: a. x.y'+x.y.z+x'.y.z' b. x.('+2)+x".y.z' c. ry: e.xyz + x f. None of the above d. 10. The internal design of any multiplexer can be described as: a. AND-OR circuit b. OR-AND circuit d. One level of minterms e. One level of maxterms. C. NAND-OR circuit f. None of the above 11. The Boolean expression as a POS of F implemented in the following circuit is (where D; has the highest priority in the priority encoder): DS 110 Ao 1 12 13 A 0 w 2x4 Decoder D D2 4x1 MUX D S 1 SO B BE X D. 4x2 D Priority Encoder D2 D z w a. F(x, y, z, w)=(x + y)(y + w) b. F(x, y, z, w) = (x+y)(x'+y+ w)(x+2 + w) c. F(x,y,z, w) = x.y+y".w+x.2'. d. F(x, y.z, w)=(x + y)(y +w)(x+2 + w) e. F(x, y, z, w)=0 f. F(x, y... w) = 1 g. All of the above h. None of the above 3