You are an enterprise application developer. You create an order processing application.
The application must meet the following requirements:

The order is scheduled for delivery if all products are available.
The order is back-ordered if any one product is not available.
The customer can cancel the back-ordered order.
The order is scheduled for delivery if the customer does not cancel it.
The order is closed after delivery.

You need to select the state diagram that translates the requirements. Which diagram should you choose?

A.
A

B.
B

C.
C

D.
D