Let U = {1, 2, 3, 4, 5, 6, 7}, A = {2, 4, 6}, B = {1, 2, 3, 5, 7}, and C = {1, 3, 6, 7}. Find A ∩ Ø a) { } b) {1, 3, 5, 7} c) {1, 2, 3, 4, 5, 6, 7} d) {2, 4, 6}