Question 4 (25 points) An activity graph for a software development project is shown in Figure 1. The number corresponding to each edge of the graph indicates the number of days required to complete the activity represented by that branch. Create a Table showing the Activity, EST, and LST and Slack Find the critical path. What is the minimum time the project will take to complete? STARTA FINISH Figure 1 An activity graph for a software development project Activ EST LST Slack B..C B..D C..E E..H E..F F.I D..G I..J I..K K..L H..L Question 5 (10 points) develop a use-case diagram for an on-line telephone directory to replace the phonebook that is provided to you by your phone company. The directory should be able to provide phone numbers when presented with a name; it should also list area codes for different parts of the country and generate emergency telephone numbers for your area