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Garbage Collector question

 
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at what point the object created in line 1 eligible for garbage collector?
a) 1
b) 2
c) 3
d) 4
e) It's not possible to know for sure
My first guess was C (on line 3), but the answer says option E. any ideas...?
 
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return doStuff2( mx );
We don't know what doStuff2 does with its reference to the X object. It might save the reference in some field or collection.

In this example, doStuff2 makes the X object reachable from the field x and from the ArrayList a.
 
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