根据关系模型Students(学号,姓名,性别,出生年月)，统计学生的平均年龄应使用______。

A：SELEC T COUNT() AS 人数,AVG(YEAR(出生年月)) AS 平均年龄 FROM Students

B：SELEC T COUNT(*) AS 人数,AVG(YEAR(出生年月)) AS 平均年龄 FROM Students

C：SELEC T COUNT(*) AS 人数,AVG(YEAR(DATE())-YEAR(出生年月)) AS 平均年龄 FROM Students

D：SELEC T COUNT() AS 人数,AVG(YEAR(DATE())-YEAR(出生年月)) AS 平均年龄 FROM Students