I work at a library, and I do largely admin-type stuff, plus the library usual of putting books away, shifting collections, and all that. And I've also been asked to put together a desk for a new scanner and dust the shelves. The cleaning crew isn't supposed to touch the shelves where the books are. So I guess I'd have to ask why the admin was asked to do it, and why the basement was being cleaned at this time. None of your answer options really fit.