The architectural features of the product need to be a) Evolved around sprint delivers. b)Completely designed upfront before the sprints. c) Decided at least at the skeleton level in the Sprint Zero.

A) Evolved around sprint delivers. There is no iteration 0 in Scrum. Some teams customize Scrum to include an iteration called Sprint 0 before the first sprint to do the initial design. This is the replacement of the Traditional "Big-upfront design" of waterfall. Such practices defeat the purpose of empiricism.