有学生表 Student(S# char(8), Sname char(10), Ssex char(2), Sage integer, D# char(2), Sclass char(6)) 。要检索学生表中“所有年龄小于等于 19 岁的学生的年龄及姓名”, SQL 语句 正确 的是? A. Select Sname From Student Where Sage <= 19 B. Select Sage, Sname From Student Where Sage <= 19 C. Select * From Student Where Sage <= 19 D. Select Sage, Sname From Student