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.

XZCG BDGK VYAE MORV

VYAE

XZCG ⇒ X → (+2) → Z → (+3) → C → (+4) → G (ODD) BDGK ⇒ B → (+2) → D → (+3) → G → (+4) → K VYAE ⇒ V → (+3) → Y → (+2) → A → (+4) → E (ODD) MORV ⇒ M → (+2) → O → (+3) → R → (+4) → V