Which statements concerning the event model of the AWT are true？（）  

• A、At most one listener of each type can be registered with a component.
• B、Mouse motion listeners can be registered on a List instance.
• C、There exists a class named ContainerEvent in package java.awt.event.
• D、There exists a class named MouseMotionEvent in package java.awt.event.
• E、There exists a class named ActionAdapter in package java.awt.event.