Part l (10 pt, 2 pt. each) Select one answer for each of the following questions. 1. Let A (x e Z | x Is even), B (5,7,8,12, 13,15), and C (3,5,9,12,15,16) The universal set U is the set of all Integers. Which of the following sets corresponds to the set operation (AUB) n C? a. (3,9) b. (12,16) . (3,5,9,15) d. (5, 12, 15, 16) 2. Let A- (x E Z | x is even), B- (5,7,8, 12,13,15), and D- (2,3,5,7, 11,13). The universal set U is the set of all integers. Which of the following set operations returns the set (15)? b. (AUD) n B UIC d. (AnD) -B 3. Which of the following relations is not a function? a. f: R R such that f(x)-x2/2. b. fR R such that f(x) 3|. c. f:R IR such that f(x) logz x. d. f:R R such that f(x) 12x]