(20 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: Activity Immediate Predecessors Duration in week) A 2 B 3 1 B D 5 AC E 7. B F 5 C G D. F N H 6 EF I 4 G H a) (10 points) Draw the project network diagram. b) (7 points) Determine the critical path and critical activities of this project. c) (3 points) What is the earliest the project can be completed