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

GIK TUV BDF NPR

TUV

GIK  ⇒ G →(+2)→ I →(+2) → K TUV ⇒ T →(+1)→ U →(+1)→V (THIS IS ODD) BDF ⇒ B →(+2)→ D →(+2) → F NPR ⇒ N →(+2)→ P →(+2) → R