Consider the following relations on {1, 2, 3, 4}. What of the following relations are reflexive?
(A) $$R_1 =$$​ {(1, 1), (1, 2), (2, 1), (2, 2), (3, 4), (4, 1), (4, 4)}
(B) $$R_2 =$$​ {(1, 1), (1, 2), (2 1)}
(C) $$R_3 =$$​ {(1, 1), (1, 2), (1, 4), (2, 1), (2, 2), (3, 3) (4, 1), (4, 4)}
(D) $$R_4 =$$​ {(2, 1), (3, 1), (3, 2) (4, 1), (4, 2), (4, 3)}
(E) $$R_5 =$$​ {(1, 1), (1, 2), (1, 3), (1, 4), (2 2), (2, 3), (2, 4), (3, 3) (3, 4), (4, 4)}
Choose the correct answer from the options given below: