All of the Following Are Business-Critical Integrity Constraints Except

Multiple Choice

All of the following are business-critical integrity constraints except:

A) The system will not allow an entry for an order for a nonexistent customer.
B) The system will not allow returns of fresh produce after 15 days past delivery.
C) The system will not allow shipping a product to a customer who does not have a valid address.
D) The system will not allow shipping a nonexistent product to a customer.