31. Suppose you are the project manager of a software project requiring the following activities. Activity Name Duration Immediate Activity No. (weeks) Predecessor 1. Obtain requirements 4 2. Analyse operations 4 3. Define subsystems 2 1 4. Develop database 4 1 5. Make decision analysis 3 2 6. Identify constraints 2 5 7. Build module 1 8 3,4,6 8 Build module 2 12 3,4,6 9. Build module 3 18 3,4,6 10. Write report 10 6 11. Integration and test 8 7,8,9 12. Implementation 2 10,11 (a) Draw the Activity Network representation of the project. (b) Determine ES, EF and LS, LF for every task. (c) Draw the Gantt chart representation of the project.