A project manager provides senior management with a status report. The project manager has developed a CPM diagram showing two activities with negative total slack.Which of the following conclusions can management derive from this analysis?
A、The two activities are critical activities of the project
B、The project manager has miscalculated because it is possible to have at most one activity with negative slack
C、Late finish is less than late start for both activities
D、The project is progressing ahead of schedule since there are already activities with negative slack