Just go with whichever has "K visa" listed under it. K visas are handled just like immigrant visas but the actual K visa is a nonimmigrant visa. When my fiancee was at the interview, they put her in the immigrants line instead of nonimmigrants.
But it looks like you still have to wait for p3 from the embassy,4 months seem way too long. I would give them a call and see what's going on, they have phone numbers just for American citizens, they also have live chat and video chat so you can contact them. I've used their live chat and got to a real person pretty quickly. Some people also ask their congressman for help.