Atank is connected to two pumps that feeds chemicals in the ratio of 1: 2. the mixture is agitated by a mixer for 30 seconds. after the mixing has stopped for 20 seconds. the discharge valve is opened. explain the process and the rationale of your design. (a) [5 marks] (b) draw up a system function table that identifies the inputs and outputs for th process. include the following in the table: . description status of sensors action of actuators plc addresses steps for the program activity of each step [5 marks] (i) write a plc program that will control the above batch process