Given that R’ = {1, 3, 5, 7, 9}, S = {3, 4, 5} and R’ = {4, 6, 8, 10}, then U is

• A.{1,9,4,6,6,7,8,9,10}
• B.{1,3,4,5,8}
• C.{4,5,6,8,10}
• D.{1,4,6,8,10}