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11. class Snoochy { 
12. Boochybooch； 
13. public Snoochy（） { booch = new Boochy（this）； } 
14. } 
15. 
16. class Boochy { 
17. Snoochy snooch； 
18. public Boochy（Snoochy s） { snooch = s； } 
19. } 
And the statements： 
21. public static void main（String[] args） { 
22. Snoochy snoog = new Snoochy（）； 
23. snoog = null； 
24. // more code here 
25. } 
Which statement is true about the objects referenced by snoog， snooch， and booch immediately after line 23 executes？（） 

11. rbo = new ReallyBigObject（）； 
12. // more code here 
13. rbo = null； 
14. /* insert code here */ 
Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo？（）