The correct answer is C, which uses a transformation edge to indicate that when an order is closed, information is transformed or processed to notify the customer. This is expressed in UML with an object flow that has a transformation property, which specifies how an object is transformed from one state to another as it flows along the edge. Thisis appropriate for a scenario where closing an order leads to the creation of a customer notice, implying some form of transformation or processing of the order information to generate the notice.
References:
* UML 2.5 Specification: The UML 2.5 specification details how object flows with transformations can be used to show that one piece of data is transformed into another as it flows from one action to another.