I too wondered what the question was intended to mean. Out of various options I selected one of the wrong ones - namely, "is online peicemeal restore (as opposed to offline piecemeal restore) unsupported". The BOL page referrred to in the explanation states that online piecemeal restore is supported in Enterprise edition and not in other editions (probably a BOL error given that evaluation and developer editions normally contain all the enterprie edition stuff), so the answer is "No it isn't unsupported", ie translated as "no" for what I thought the question meant. But the question actually intended was presumably "Does the database have to go offline at some point in an online piecemeal restore", and in all fairness to the question's author that's what I should have realised it meant when I first read it - and I don't have the excuse of not having native-level capability in English.