You are assigned the task of building a panel containing a TextArea at the top， a label directly below it，and a button directly below the label. If the three components are added directly to the panel. Which layout manager can the panel use to ensure that the TextArea absorbs all of the free vertical space when  the panel is resized？（）

import java.awt*；  
public class X extends Frame （  
public static void main（string args） （ 
X x = new X （）；  
X.pack（）；  
x.setVisible（true）； 
） 
public X （） （  
setlayout （new GridLayout （2，2））；  
Panel p1 = new panel（）；  
 Add（p1）；  
 Button b1= new Button （“One”）；  
 P1.add（b1）； 
 Panel p2 = new panel（）；  
 Add（p2）；  
Button b2= new Button （“Two”）；  
 P2.add（b2）；  
 Button b3= new Button （“Three”）； 
 add（b3）；  
Button b4= new Button （“Four”）；  
add（b4）；  
）  
）  
Which two statements are true？ （）