Mike,
It has 6 options...period! No interpretation. The seller is probably comsidering the thumb nothces an option, but they are standard on this model. No extra option counted for 4", 4 1/2" or 5". His sheath is standard also so there's no floating option there...there. Hope this helps.
Best, Capt. Chris
PS: Options include...

* Nickel silver single hilt
* Aluminum & black spacers
* Stag handle
* RH finger grips
* Wrist thong
* Compass installed
...CCS