Which of the following statements are TRUE about the elements within subsystems and their visibilities? 1. None of the elements within a subsystem should have public visibility. II. Only the elements that call external classes should have public visibility. III. Only the elements that construct subsystem interface should have public visibility. IV. It is a good practice to use a faade class with elements that have public visibility. (4 Puan) sk O II, III, and IV All of them III and IV Only 1 None of them 5 In which of the following situations, the decision is NOT made based on efficiency vs. modifiability design trade-off? * (4 Puan) when choosing between repository or MVC architectural pattern when choosing between opaque or transparent layering when determining the visibility of a class attribute that is heavily accessed by other classes when deciding whether to use faade pattern when choosing between vertical or horizontal mapping for relational database design