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 - 6 = 3rd letter

Now, we check each options.

Option (a): OIP (Not Follow)​

O + 4 $$\neq$$ I and I - 6 $$\neq$$ P

Option (b): LPJ (Follow)

L + 4 = P and P - 6 = J

Option (c): OSM (Follow)​

O + 4 = S and S - 6 = M

Option (d): MQK (Follow)​

M + 4 = Q and Q - 6 = K

Thus, correct option is (a).