Consider the set of relations given below and the SQL query that follows:
Students: (Roll_number, Name, Date_of_birth)
Coursed: (Course_number, Course_name, Instructor)
Grades: (Roll_number, Course_number, Grade)
SELECT DISTINCT Name
FROM Students, Courses, Grades
WHERE Students.Roll_number = Grades.Roll_number
AND Courses.Intructor =Sriram
AND Courses.Course_number = Grades.Course_number
AND Grades.Grade = A
Which of the following sets is computed by the above query?
- Names of Students who have got an $\textsf{A}$ grade in all courses taught by Sriram
- Names of Students who have got an $\textsf{A}$ grade in all courses
- Names of Students who have got an $\textsf{A}$ grade in at least one of the courses taught by Sriram
- None of the above
