HanShi (6/6/2014)

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I was in doubt, because I found it difficult to get the intention of the question (perhaps because I'm not native English speaking). Did I need to take the question literally ("database needs to go offline when starting a restore") or do I need to take the question in general ("database needs to be offline during all the restore sequenses).

So I chose the wrong answer....

The linked article states:

•Online piecemeal restore scenario

In an online piecemeal restore, after the partial-restore sequence, the database is online, and the primary filegroup and any recovered secondary filegroups are available. Filegroups that have not yet been restored remain offline, but they can be restored as needed while the database remains online.