1. import java.util.*；  2. public class TestSet {  3. enum Example { ONE， TWO， THREE }  4. public static void main（String[] args） {  5. Collection coll = new ArrayList（）；  6. coll.add（Example.THREE）；  7. coll.add（Example.THREE）；  8. coll.add（Example.THREE）；  9. coll.add（Example.TWO）；  10. coll.add（Example.TWO）；  11. coll.add（Example.ONE）；  12. Set set = new HashSet（coll）；  13. }  14. }  Which statement is true about the set variable on line 12？（） 

• A、 The set variable contains all six elements from the coll collection， and the order is guaranteed to be preserved.
• B、 The set variable contains only three elements from the coll collection， and the order is guaranteed to be preserved.
• C、 The set variable contains all six elements from the coil collection， but the order is NOT guaranteed to be preserved.
• D、 The set variable contains only three elements from the coil collection， but the order is NOT guaranteed to be preserved.