Which of the following relations is an equivalence on the set A = {1,5,11}? O {(1,1),(1,5),(5, 11),(5,5),(11,11) O {(1,1),(5,5),(1,5), (11,1),(5,11),(11,5),(5,1),(1,11)} O {(1,1),(5,5),(1,11),(11,1),(5,11),(11,11)} None of the others O {(1,1),(5,5),(1,5),(5,1),(11,11)