In the program below, which Java statement registers an event listener object with an event source?

ClassB b = new ClassB();

myFrame.getContentPane().add( button1 );

myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

button1.addActionListener( b );

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing. JFrame; public class ClasSA public static void main( String [] args ) JFrame myFrame new JFrame ("Something"); myFrame.setLayout new FlowLayout); myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) myFrame.setSize( 275, 110); JButton button1new JButton ("Button 1"); ClassB bnew ClassB(); button1.addActionListener( b); myFrame.getContentPane().add( button1); myFrame.setVisible(true); class ClassB implements ActionListener f public void actionPerformed(ActionEvent e) f System.out.println ("Something happened")