Q.4 (a) (i) Outline what is meant by the term Object Relational Mapping (ORM). [3 Marks] (ii) Given the following class diagram, describe three different ways in which the classes could be mapped to a relational database. For each of the three ways, provide one advantage and one disadvantage that it provides. [12 Marks] Department ld Name Sales Department Monthly Target Human Resources Department EmployeeCount (b) (i) Describe what is meant by Test Driven Development. In your answer, discuss the steps that are followed in developing / testing code using this approach. [9 Marks] (ii) Explain why and how Mock Objects can be utilised in a Test Driven Development approach and what benefit they can provide. [9 Marks]