Question 12. (4 points) What results when the projection P1.3 is applied to the 4-tuple (Billie Bob, 555-5555, United States, 19)? Question 13. (6 points) The 3-tuple in a 3-ary relation represent the following attributes of a stude tabase: student ID number, name, phone number. a) Is student ID number likely to be a primary key? (Justify your answer) b) Is name likely to be a primary key? (Justify your answer) c) Is phone number likely to be a primary key? (Justify your answer) Question 14. (5 points) Let R be the relation on the set {1, 2, 3, 4) containing the ordered pairs (2.1). (2,3), (3, 1), (3,4), (4,1), and (4,3). Find the transitive closure of R