Professional and Scientific Staff Management (PSSM) - Data Management Layer Based on the design of the problem domain layer of the application, you should design the data management layer. In this case, the data management layer should be comprised of data access and manipulation classes and a relational database. You should use class and communication diagrams to describe the connectivity among the classes on the problem domain and data management layers. Be sure to apply the rules of normalization to the relational database to ensure processing efficiency and to develop a clustering and indexing strategy for the relational database. For the PSSM project, please complete the following as part of milestone 9: Apply the rules of normalization to the class diagram to check the diagram for processing efficiency. Develop a clustering and indexing strategy. Describe how your strategy will improve the performance of the database. Describe the connectivity among the classes on the problem domain and data management layers. You should use class and communication diagrams to describe the connectivity among the classes on the problem domain, physical architecture, data management, and human computer interaction layers.