Choose, Among the Following Statements, the Ones Which Correctly Describe

Choose, among the following statements, the ones which correctly describe the inner workings of a basic Kanban production system.
1) A Kanban card is attached to every 10th container of items that has been produced
2) A Kanban card is an easily understood, virtual signal
3) Kanban is the Japanese word for container
4) The Kanban card stays with the container until the contents are used once attached

A) (2)
B) (2) and (3)
C) (1) and (4)
D) (4)