Basic CPM/PERT methods ignore resource constraints when scheduling project activities. In many projects, however, resource constraints, conflicts and overloads can be real obstacles to project completion. Which of the following approaches would be the best approach (assuming all approaches are feasible) for the project manager to resolve difficulties due to resource constraints? Question 20 options: Move the start time of activities with slack Move the start time of critical activities Obtain more resources Delay the project completion date