Question: At the beginning of this chapter, you were hired by Rats R Us to build the control logic for the production facilities for a new anticancer chemical compound being tested on rats. The control logic must manage the opening and closing of two valves, A and B, downstream of the mixing vat. Valve A is to open whenever the pressure in the vat exceeds 50 psi (pounds per square inch) and the salinity of the mixture exceeds 45 g/L (grams per liter). Valve B is to open whenever valve A is closed and the temperature exceeds 53°C and the acidity falls below 7.0 pH (lower pH values mean more acidity). How many and what type of logic gates will be needed in the circuit? Answer this question by finding the canonical sum-of-products form for the logic circuits to control A and B.