Which of the following is the correct definition of the heijunka principle used in the Toyota Production System? A part supplied by an outside supplier which indicates the information about the part, the supplier and the quantity for one container. A way to mistake-proof a process and prevent errors from occuring. A rope running along the assembly line over the work area which is pulled when there is a problem during production. The idea of distributing volume and different specifications evenly over the span of production such as a day, a week and a month