In each question below is given a group of letters followed by five combinations of number/symbol codes numbered a:, b:, c:, d: and e:. You have to find out which of the combinations correctly represents the group of letters based on the following coding system and the conditions and mark the number of that combination as your answer.

Conditions :
(i) If both the second and the fourth- elements are vowels, both these are to be coded as the code for the fourth vowel.
(ii) If the group of letters contains only one vowel, the codes for the first and the last letters are to be interchanged.
(iii) If first element is a vowel and the last a consonant, then that vowel is to be coded as the code for the letter following it.