UMG Developer (9/29/2010)
I think you need to check the answer key for this question. It lists "Column references can pull data from multiple rows." as one of the options you have to pick, but then in your explanation you say "No column reference pulls data from multiple rows."
And the BOL article you link to says 'No column reference pulls data from multiple rows.", so it seems that "Column references can pull data from multiple rows." is not a correct choice. Either that or you meant for the can to be can't.
Fully agree with UMG Developer.
And I'd also agree with Chris Büttner--but in order to gain a point, just stick with the wording in BOL and disregard anything else, as computed columns need to be persisted
in order to be used in an index (and the question was only about 'computed columns' but not about 'persisted computed columns').