* This section is based on a given Case Scenario. Given Case Scenario: Catherine is leading a design and production project team to develop a mobile app for a client. As one of the project members, you need to answer the following questions for her. Students should finish reading the given Case Scenario and the whole question first, before answering. Students should focus on answering questions, based on our course materials. 1. (4 marks) At the beginning stage of the mobile app project, Catherine does not know the general mobile system as she is not a technical person. You are a team member. Name and briefly introduce the two bottom layers (including the bottom infrastructure layer) of a typical multi-layer mobile ecosystem to Catherine. 2. (6 marks) The project team is discussing different design issues in the design stage. Catherine has no mobile app design background. a) Introduce the term Unity in design principles to her. b) Further explain how this is applied to designing a mobile app including more than one screen page. c) Also give an example case to explain your answer for part b), with diagrams to illustrate