What will be the output of the program?


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What will be the output of the program?

TreeSet map = new TreeSet(); 
 map.add("one"); 
 map.add("two"); 
 map.add("three"); 
 map.add("four"); 
 map.add("one"); 
 Iterator it = map.iterator(); 
 while (it.hasNext() ) {     
   System.out.print( it.next() + " " ); 
 }

 

A. one two three four
B. four three two one
C. four one three two
D. one two three four one