2. (21 points) A project is considered completed when activities A-F have all been completed. The precedence relationships and duration of each activity are given in the table below: Duration (in Activity Immediate Predecessors week) A 3 B 3 1 A D 5 AB E 7 B, C F 5 D, E a) (10 points) Show the project precedence relationships with a network diagram. b) (8 points) Determine the critical activities of this project. c) (3 points) What is the earliest the project can be completed