Problem Statement

Question 35 You have two relations, R(A,B) and S(B,C). Which of the following operations can legally be applied to them? R ∪ S R × S R ⋈ S π A (R) Select your answer to the problem below: 2,3,4 1,2,3 4,3,1 1,2,4 Question 36 An entity 'student' takes part in two relationships: 'Enrolls(Student, Course)' (M-N) 'MentoredBy(Student, Professor)' (1-N from Professor). Once these are mapped to a relational schema, how many relations exist in total? Select your answer to the problem below: 4 5 6 3 Question 37 A three-tier database architecture places an application layer between the client and the database itself. Which of the statements below are true of this setup? The middle tier handles business logic and API calls. Connection pooling and transaction coordination occur in the middle tier. Clients directly manage database files. The three-tier design improves scalability and security. Select your answer to the problem below: 1, 4, 3 2, 3, 4 1, 2, 4 1, 2, 3 Question 38 Re