Your first answer is technically correct, however this is one of those greyish areas in A.T.C.
If the pilot gives his callsign as November One Hundred Alpha Bravo then I would use this.
You could abbrerviate it to November - Zero Alpha Bravo ( just like Golf - Alpha Bravo )
American pilots however tend to give their aircraft type and typically use something like -- Falcon One Hundred Alpha Bravo.
As always these things are clear as mud.