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.

TXBV

THE LOGIC;

1) GKPJ,

G → (+4) → K → OPPOSITE → P → (-6) → J

2) TXBV,

T → (+4) → X → OPPOSITE → C(not B) → (-6) → V

2) KOLF,

K → (+4) → O → OPPOSITE → L → (-6) → F

4) QUFZ

Q → (+4) → U → OPPOSITE → F → (-6) → Z

Thus, TXBV is the odd one.