5. Which of the following two sets are equal? A. A = {1, 2} and B = {1} B. A = {1, 2} and B = {1, 2, 3} C. A = {1, 2, 3} and B = {2, 1, 3} D. A = {1, 2, 4} and B = {1, 2, 3} 6 TIL 1-​