Given that A = {1, 5, 7}

B = {3, 9, 12, 15}

C = {2, 4, 6, 8}

Find (A ∪ B) ∪ C

• A.{1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15}
• B.{1, 2, 3, 5, 6, 8, 12, 15}
• C.{2, 4, 5, 9, 12, 15}
• D.{1, 5, 6, 7, 8, 9, 12, 15}
• E.