I'll let others mopre knowledgeable than I answer, although I'm virtually positive it was not the first two.

One thing to keep in mind is that if your rifle is a mixmaster, with several WWII replacement parts, I wouldn't be in too much of a hurry to refinish to post-WWI standards. If it is totally correct (with Mark I parts) I would also not want to refinish, as you will lower the value significently IMHO.