Immediate Predecessors Activity a b El + A 3 6 B 2 4 3 A 1 5 2 D B 4 6 5 E CD 6 6 6 F DE 3 2 The values of a, b, and m in the table are in months. 3a) Draw the project network where Activities are on Nodes (AON). [10 marks) 3b) Determine the critical path by referring to the most likely value for the activity's duration, l.e.m. [10 marks) 3c) If the project manager wants to have a 95% chance of completing all preparations by the end of December 2025, when should the work begin? [20 marks]