QUESTION 4 a) Explain how you derived the conceptual class model from the requirements, and how you decided which potential classes would be included in your final implementation, the relationships, and their cardinalities. You may use diagrams where appropriate. In particular. Use examples to show how some classes may have been discarded and why. (15 marks) b) You have been given a project to manage that has a reasonably well-defined set of requirements but has a very short timescale. You are using the RUP to develop the project with short iterations. You have a small team working on it (fewer than 10 people), and unfortunately, less than a third of the way through the project, you lose an important team member due to long-term illness. Discuss the ways you might use to cope with this, and the different ways your coping strategies might impact cost, timescale, functionality etc. (10 marks)