QUESTION 28

QUESTION 28 
Given: 
 
1. import java.util.*; 
2. public class Example { 
3.     public static void main(String[] args) { 
4.         // insert code here 
5.         set.add(new Integer(2)); 
6.         set.add(new Integer(1)); 
7.         System.out.println(set); 
8.     } 
9. } 
Which code, inserted at line 4, guarantees that this program will output [1, 2]? 
 
A. Set set = new TreeSet(); 
B. Set set = new HashSet(); 
C. Set set = new SortedSet(); 
D. List set = new SortedList(); 
E. Set set = new LinkedHashSet(); 
Solution : A