[10 pts.] Consider the following relations on { 1, 2, 3}. R1 = {(1, 1), (1, 3), (2, 2), (3, 1) } R2 = {(1, 1), (2, 2), (3, 1), (3, 3) } R3 = { (1, 2), (2, 1), (3, 3) } RA = { (1, 3), (2, 3) } Which of these relations are reflexive and symmetric? Justify your answers