In Java event handling, which event is generated when a button is clicked?

What is an event in Java?

A. An action or occurrence to which a program can respond

B. A Java class that handles exceptions

C. A type of exception

D. A data type

In Java event handling, what is an event source?

A. An event listener

B. A keyword used to declare events

C. A method that handles events

D. An object that generates events

Which package in Java contains classes for event handling?

A. `java.util`

B. `java.swing`

C. `java.awt.event`

D. `java.io`

What is an event listener in Java?

A. A Java class that generates events

B. An object that listens for events and responds to them

C. A method that handles events

D. None of These