b. Fill out the 6 KMAPS below, each with a different set of variables as control variables, and find the data inputs (I0I3) for each. (CD as controls) I0=I1=I2=I3= (AB as controls) (BD as controls) (AC as controls) (BC as controls) l0=l1=l2=l3= (AD as controls) l0=I1=I2=l3= c. Given only 2-input NAND, NOR, XOR, XNOR gates, and inverters, which is the preferred set of control signals