4.a) Suppose, UAP Registrar's office maintains data about the following entities: Courses, including number, title, credits and prerequisites. Students, including student_id, name and program. Teachers, including teacher_id, name, department and title. Furthermore, grade points awarded to students in each course must be stored. Also assume that each course can be supervised by only one teacher, but a teacher can supervise more than one course. Construct an E-R diagram for the Registrar's office. Try to use only binary relationship sets. b) Describe Delete and Update anomalies with an example for each scenario