【单选题】

有学生选课关系 SC(S#，C#，GRADE )，其中 S#为学号， C#为课程号， GRADE 为成绩。要查找 "选修了C01号课程且成绩不低于 90分的学生的学号 "，下列哪一个 SQL语句正确表达了此查询请求?

A. SELECT S# FROM SC GROUP BY C# = CO1’ HAVING GRADE≥90;
B. SELECT S# FROM SC GROUP BY C# = 'C01’ WITtH GRADE≥90;
C. SELECT S# FROM SC GROUP BYC# = C01’ WITH GRADE≥90;
D. SELECT S# FROM SC HAVING C# = ’C01' AND GRADE ≥90;