Interesting question.

It's fairly straightforward provided one eliminates the obviously wrong options rather than looking for an obviously right one - I've never used this transform (SSIS is not my cup of tea) but it's obvious that the transform needs something (a filename which includes the full path) to tell it where to put each image and in Windows systems such filnames are strings, not necessarily unicode ones. The idea that the trasform requires the two columns (name and content) to be in a specific physical order is so unlikely that it can safely be dismissed, unicode is not required for windows filenames, the destination for an image is the file designated by the file path not anything to do with OLEDB, as that's required it can't be optional, and a transform called "export column" iwould be called something else if it were not intended to export a column, so it isn't the wrong tool for the job. That leaves only one option, which can't be eliminated because the filepath does have to be a string or windows won't recognize it, so that option must be the right answer.