An industry is being set up where one of the processes involves dispersing gas in liquid and other process involves viscous liquid which deposits on the wall and has to removed timely to promote heat transfer. Which of the following equipment you would suggest respectively for each of the purpose? Select one: a. helical ribbon agitator can be used in both cases b. Paddle agitator, helical ribbon agitator c. Turbine, helical ribbon agitator d. Turbine,Paddle agitator