A Kanban system is an important mechanism for lean system management. Which one of the following statements regarding the operation of a Kanban system is best?

a$.$ A Kanban and a container move as a pair once production begins at the fabrication process.

b$.$ A typical Kanban used in the JIT system includes information such as item number, unit price, competitor's product name, and its price.

c$.$ An empty container can be exchanged for a full container at the storage location even though no Kanban is on the full container.

d$.$ A Kanban can be used to set the order quantity but not the inventory level.