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What is the output of the HashSet

HashSet<String> set =
new HashSet<String>(Arrays.asList(new String[]{"Java","J2EE",null})) ;
 
Iterator<String> setInterator = set.iterator() ;
while(setInterator.hasNext()){
       System.out.println(setInterator.next()) ;
}
 
Answers:
 
A) NullPointerException
B) HashSet doesn't allow null
C) Runtime Exception
D) Java
    J2EE

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