The java.awt.AWTEvent class is the highest-level class in the AWT event-class hierarchy.
In Core Java, the top of the AWT (Abstract Window Toolkit) event hierarchy is the java.awt.AWTEvent class. The AWTEvent class is the superclass for all AWT event classes. It is part of the AWT package and provides a common base class for all types of events that can occur in an AWT-based graphical user interface (GUI) application.
So, the correct answer is java.awt.AWTEvent.