Please, question 8

Question 5: Consider the below E-R diagram. Which one of the following items is correct regarding Student entity set? 2 (A) The set of { StudId, firstName } is a superkey but is not a candidate key. (B) The set of { StudId, firstName } is a superkey and is a candidate key. (C) The set of { StudId, firstName } can be selected as the primary key. (E) All of the above items are correct. Question 6: A,B and C are tables of a same degree. Which option is correct? (A) (AB)(BA)=AB (B) (AB)(BC)=AC (C) (AB)(BA)=(AB)C (D) (AB)(CB)=(AB)C (E) Non of the above options is correct. Question 7: Consider the following rdiagram: What is the cardinality of Y-X relationship? (A) One-to-One (B) One-to-Many (C) Many-to-One (D) Many-to-Many Question 8: The E-R diagram of Question 5 is prepared for a university which sets strict requirements for students. Each student must be always enrolled in at least three classes. Also, each class must have at least five students to be able to run during the semester. Determine the min-max notation for the Student-Class relationship: Please notice that participation constraints are not shown in the above diagram. Question 9: Which option is incorrect