Extracted text: 5. Let R1 and R2 be the relations on {1,2,3,4} given by R1 = {(1,1), (1,2), (3,4), (4,2)} R2 = {(1,1), (2,1), (3,1), (4,4), (2,2), (3,3)} %3D %3D a) List the elements of R, • R, and R, ● R,: b) Is R2 reflexive? Justify your answer. c) Is R, o R, transitive? Justify your answer. d) Find R2-R1.