All of the Following Are Business-Critical Integrity Constraints,except

Multiple Choice

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

A) System does not allow an entry for an order for a non-existent customer
B) System does not allow returns of fresh produce after 15 days past delivery
C) System does not allow shipping a product to a customer who does not have a valid address
D) Systems does not allow shipping of a non-existent product to a customer