数据库的逻辑模型设计阶段的任务是将______转换成关系模式。

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