检索选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT语句是（）。 A: SELECTS B: FORMSCWHEREC C: =“C2”ANDGRADE＞＝(SELECTGRADEFORMSC D: EREC E: =“C2”) F: SELECTS G: FORMSC H: EREC I: =“C2”ANDGRADEIN J: ELECTGRADEFORMSC K: EREC L: =“C2”) M: SELECTS N: FORMSC O: EREC P: =“C2”ANDGRADENOTIN Q: ELECTGRADEFORMSC R: EREC S: =“C2”) T: SELECTS U: FORMSC V: EREC W: =“C2”ANDGRADE＞＝ALL