What will be the output of this code snippet?

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What will be the output of this code snippet?

Java 
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
System.out.println(str);


Compilation error

Prints nothing

Reads and prints one line of input

Throws IOException always

This question is part of this quiz :

Java BufferedReader vs Scanner and Fast I/O
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Java Quiz
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