A food factory wants to establish a new product line. The chemical engineer in the team assigned for this purpose will recommend the tank given in Figure 2 below for the storage tank in his market research. He also wants to add the control system before making a presentation to recommend the tank. Help him with the selection by answering the following questions. a) Write the input and output variables. b) Select the controlled variable and the setting variable. What was the most important criterion in your choice? c) How do you propose a control system to keep the output variable selected as the controlled variable at the desired value. Add to the shape. d) Draw the block diagram of the control diagram