9. Let X = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9] and Z = { 1, 3, 4, 5, 7). What is XnZ? b. { 2, 4, 6, 8} c. { 1, 3, 4, 5, 7} d. {0, 1, 3,9}​