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单项选择题

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?() 

    A. System.gc();
    B. Runtime.gc();
    C. System.freeMemory();
    D. Runtime.getRuntime().growHeap();
    E. Runtime.getRuntime().freeMemory();

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