In a certain chemical processing plant, a liquid chemical is used in a manufacturing process. The chemical is stored in three different tanks. A level sensor in each tank produces a HIGH when the level of chemical in the tank drops below a specified point. Design a circuit that monitors the chemical level and indicate when the level in at least two tanks drops below the specified point.

1. Obtain the Boolean expression for the plant.

2. Complete the truth table for the plant.

3. Use K-map to simplify the Boolean expression in (1.).

4. Draw the circuit using 2-input NAND gates only. NAND is NOT AND or (AND)