Below is an activity on node or precedence diagram for a project starting with activity "A" and ending with activity S. Each activity has an estimated time duration and the arrows indicate what activities are dependent on others and which can be done simultaneously. M 1 week B 3 weeks 2 Weeks Q 1 Week G 2 weeks J 2 Weeks P 1 Week F 2 Weeks A 1 week 3 weeks E 3 weeks K 3 weeks L 1 week N 1 Week S 2 Weeks 1 Week D 5 weeks o 1 Week 1 5 weeks What is the project completion time (overall duration)? Identify the project's critical path? What does it mean? Which activity has the greatest slack time (most amount of flexibility with allocation of resources and start time) and what is that slack time