Which of the following can be used to "select all the students who have Grade greater than Ali's GRADE" Select one: a. SELECT * FROM student WHERE grade > (SELECT * FROM student WHERE name 'Ali') b. SELECT * FROM student WHERE grade > (SELECT city FROM student WHERE name 'Ali') c. SELECT * FROM student WHERE grade > (SELECT grade FROM student WHERE name= 'Ali') d. SELECT * FROM student WHERE grade > 'Ali' grade