Asking if the position has some sort of career path is a good question if framed properly. It shows you're taking the position seriously and may not be just another desk-hopper. I think it might get some interesting answers, too.
I might have seen the odd example of #6. Can't see it doing any damage apart from annoying the panel leader with something else to read. Certainly wouldn't put it in my top 50 thinks to do, but.
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