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.