Question 6
Consider the relational schemas Student, Professor, Course, Enrolled and Teaches:
Student(StudentId, Name, Age)
Professor(ProfId, Name, Age)
Course(CourseId, Title, Credits)
Enrolled(StudentId, CourseId, Grade)
Teaches(ProfId, CourseId)
Which of the following relational algebra queries will list the names of all students who have taken every course taught by Professor 'Smith' ?