Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different.

MIGF

THE LOGIC FOLLOWED HERE IS;

(All alphabets are in ascending order and all are consonants)

But,

1) MIGF ( alphabets are in descending order and one alphabet is vowel which is "I" )

Thus, it is the different one from other options.