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.