Which one of the following statements is TRUE?
◦ The number of kanban cards should be equal to the desired safety stock times alpha.
◦ Supplier performance is much more important in U.S. environments than such factors as lot sizes, scrap losses, and worker flexibility.
◦ Two operating rules for the kanban system are (1) the container size should be equal to at least seven days of supply and (2) each container must have a kanban card.
◦ The kanban system is more effective when the assembly schedule calls for small lots and does not fluctuate much from day to day.