單項(xiàng)選擇題

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 objectrbo?()

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

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