What happens when you compile and run the following program?

import java.awt.*;

public class X
{
    public static void main(String[] args) throws Exception
    {
        final Button b1 = new Button("Button1");
        final Button b2 = new Button("Button2");
        final Frame f = new Frame();
        f.add(b1);
        f.add(b2);
        f.pack();
        f.setVisible(true);
    }
}

A) Compilation error.
B) Button1 in a frame.
C) Button2 in a frame.
D) Button1 and Button2 in a frame.
E) Exception: "use java.awt.Frame.getContentPane().add() instead."