In Chapter 7, you developed a use case diagram, a domain model class diagram, and detailed documentation for three use cases. In your detailed documentation, you generated a fully developed specification and a system sequence diagram. Based on that information and the guidelines in this chapter design three layer architecture for the new system. Update the design class diagram with information on attribute types and navigation visibility. For the same three use cases, develop a set of CRC cards. Then update the DCD with method names derived from the class responsibilities on the CRC cards.