Retirement tax questions

Yes! In box 7 under distribution code it says 2B. I can choose 2 or B under the pull down menu, not both... which am I supposed to choose? And I think it’s different from last years options according to last years tax help forums, so I’m not sure if those are very helpful? Though it seems to be smart to contact the payee of the 1099r and figure out if there is supposed to be a correction made?