Which of the following diagrams represents the cardinality pairs in a situation where customer orders are filled one by one,but not all ordered items may be available at all times?

Question

Quizplus · Accepted Answer

Diagram B shows that one customer may place multiple orders (represented by the "0..*" cardinality) and that an order may contain multiple items (also represented by "0..*"), but not all ordered items may be available at all times (represented by the "0..1" cardinality). This matches the situation described in the question. Diagram A does not allow for the possibility of some items not being available, while Diagrams C and D allow for all items to be available all the time.

Which of the Following Diagrams Represents the Cardinality Pairs in a Situation