If the changes the stakeholders are requesting at each of the sites are valid requests that should be approved, the project manager should integrate these changes across all installations, not just for the customers who request the changes. 1 is incorrect because if the changes are valid, they should be approved. 2 is incorrect because changes should be uniform across the project, not piecemeal. 4 is also incorrect. Adding the changes later rather than anticipating the change requests is not cost-effective. The project manager should evaluate the changes and implement them as part of the project plan.