Which of the Following Dual-Card Kanban Rules Are Not Correct

Multiple Choice

Which of the following dual-card Kanban rules are not correct?
1) One Kanban per container
2) The more Kanban cards are in the system, the more smoothly manufacturing operates
3) Standardized Containers and loads
4) In some cases, parts can be made without a production Kanban

A) (4)
B) (2) and (4)
C) (1) , (3) and (4)
D) None of the above