在面向对象方法中，______描述的是具有相似属性与操作的一组对象。

A．SEIECT 姓名,COUNT(*) AS 外币种类 FROM 持有数; GROUP BY 姓名 HAVING COUNT(*)＞=4; ORDER BY 外币种类,姓名 DESC
B．SEIECT 姓名,COUNT(8) AS 外币种类 FROM 持有数; GROUP BY 姓名 HAVING COUNT(*)＞=4; ORDER BY COUNT(*),姓名 DESC
C．SEIECT 姓名,COUNT(*) AS 外币种类 FROM 持有数; GROUP BY 姓名 HAVING COUNT(*)＞=4; ORDER BY 外币种类 AND 姓名 DESC
D．SELECT 姓名,COUNT(*) AS 外币种类 FROM 持有数; GROUP BY 姓名 HAVING COUNT(*)＞=4; ORDER BY 外币种类+姓名 DESC