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11. class Payload { 
12. private int weight； 
13. public Payload（int wt） { weight = wt； } 
13. public void setWeight（mt w） { weight = w； } 
15. public String toString { return Integer.toString（weight）； } 
16. } 
17. 
18. public class TestPayload { 
19. static void changePayload（Payload p） {
20. /* insert code here */
21. } 
22. 
23. public static void main（String[] args） { 
24. Payload p = new Payload（）； 
25. p.setWeight（1024）； 
26. changePayload（p）； 
27. System.out.println（”The value of p is “+ p）； 
28. } 
29. } 
Which statement， placed at line 20， causes the code to print “The value of p is 420.”？（） 

11. public class Commander { 
12. public static void main（String[] args） { 
13. String myProp = /* insert code here */ 
14. System.out.println（myProp）； 
15. } 
16. } 
and the command line： 
java -Dprop.custom=gobstopper Commander 
Which two， placed on line 13， will produce the output gobstopper？（）