Three of the following four letters are alike in a certain way and one is different. Pick the odd one out.

Three of the following four letters are alike in a certain way and one is different. Pick the odd one out. Correct Answer CU

The position of the letters according to the English alphabet series. 

[ alt="Table" src="//storage.googleapis.com/tb-img/production/20/04/Table.png" style="width: 602px; height: 127px;">

Option 1 → AA - A - First positional value of alphabet, A - First Vowel according to positional value

Option 2 → BE - B - Second positional value of alphabet, E - Second Vowel according to positional value

Option 3 → CJ - C - Third positional value of alphabet, According to the series I should be there instead of U.

Option 4 → DO - D - Fourth positional value of alphabet, O - Fourth Vowel according to positional value

Hence CJ is odd one out.