I noticed that BI has many zones, but I haven't been able to figure out which zone that BI uses to trigger. Is it Zone A? Or is it all zones (layered with the largest possible area selected)? I tried watching some tutorials, but they don't really outright say. One of the official BI videos kind of hinted that it was Zone A because it was the one that was completely selected by default....but can anyone confirm, perhaps by experience or trial and error?