Which one among the following is representing equal sets?

• A.  A = {3, 6, 9} and B = {9, 12, 15}.
• B.  M = {a: a is a multiple of 2, a < 12} and N = {4, 8/ 12}.
• C.  X = {all the vowels in the English alphabet} and Y == {a, e/ t o, uh
• D.  Ail the above
• E.  None of these