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 Sorted List(); E. Set set = new LinkedHashSet()