Last one is possible if unlikely. Probably won’t know much more till the blackbox analysis is done. I am somewhat reminded of a rather famous crash that was caused by a pilot inviting his buddy who had some flight experience but not in that model of plane into the cockpit and had him do the landing. The buddy screwed up a couple of critical settings and the actual pilot didn’t notice until it was way too late to prevent the crash. Not that I’m suggesting anything similar happened in this case, it was just a very similar style of crash.