Java IO Serialization

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Question : 14 of 17
 
Marks: +1, -0
Given:
bw is a reference to a valid BufferedWriter And the snippet:
1. BufferedWriter b1 = new BufferedWriter(new File("f"));
2. BufferedWriter b2 = new BufferedWriter(new FileWriter("f1"));
3. BufferedWriter b3 = new BufferedWriter(new PrintWriter("f2"));
4. BufferedWriter b4 = new BufferedWriter(new BufferedWriter(bw));

What is the result?
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