All the following statements regarding creating of time estimates are correct EXCEPT:
A．Mathematical analysis like CPM, GERT and PERT indicate the dates in which the activity can be scheduled given resource limits and other constraint
B．Duration compression techniques including fast tracking and crashing can help in decreasing the project schedul
C．WBS classification allows for useful activity ordering and sortin
D．The duration of the project is the sum of durations for all the tasks in the projec
