Does the following relationship mean: A. Activity B has to start exactly 3 days after the start of A. B. Activity B can start at least 3 days after the start of A. C. Activity B can start at most 3 days after the start of A. D. None of the above. Does the following relationship mean: A. Activities A and B must start simultaneously, but B has to finish exactly 2 days after the finish of A. B. Activity B can start after the start of A, but has to finish at least 2 days before the finish of A. C. Activity B can start before the start of A, but has to finish at most 3 days after the finish of A. D. Activity B can start after the start of A, but has to finish at least 2 days after the finish of A