Click the Exhibit button. 
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 coll collection， but the order is NOT guaranteed to be preserved.
- D、The set variable contains only three elements from the coll collection， but the order is NOT guaranteed to be preserved.
正确答案:D
答案解析:有
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