阅读下面Applet程序 import javax.swing.*: import java.awt.*: public Class Test SwingApplet extends JApplet JLabel 1=new JLabel( This is a Swing Applet. ); public void init() ______ 程序中下画线处应填入的正确选项是
A.Container contentPane=getContentPane();contentPane.add(1);
B.Jpanel contentPane=new JPanel();contentPane.add(1);
C.contentPane.add(1);
D.add(1);