Based on the English alphabetical order, three of the following four letter-clusters arealike in a certain way and thus form a group. Which letter-cluster DOES NOT belong tothat group?(Note: The odd one out is not based on the number of consonants/vowels or theirposition in the letter-cluster.)​​

Logic: 1st letter + 4 = 2nd letter and 2nd letter - 3 = 3rd letter

Now, we check each options.

Option (a): KOL (Follow)

K + 4 = O and O - 3 = L

Option (b): RVS (Follow)​

R + 4 = V and V - 3 = S

Option (c): HLI (Follow)​

H + 4 = L and L - 3 = I

Option (d): LPN (Not Follow)​

L + 4 = P and P - 3 = M $$\neq$$​ N

Thus, correct option is (d).