You have an ios app that is "universal," meaning that it should run on the iphone 8, iphone x, and ipad. the app works differently whether it is in the "online" mode or in the "offline" mode. and, additionally, the user can perform an in-app purchase to remove advertisements that appear. you want to test all combinations. complete and extend the table below to show all possible combinations that would need to be tested if exhaustive combinations are covered.