During the execution phase of the project, the project team identified a serious project plan deviation. The scope of the project was defined correctly but the planning missed some technical deliverables that have impacted the schedule and the planned cost.In order to assure the success of the project, which should the project manager do?
A、Ask the customer to pay the cost of the deviation
B、Propose a change request, and inform the stakeholders of this case to get their supports
C、Negotiate with team to work overtime for mitigating the impact of cost and schedule
D、Negotiate with customer to reduce the scope of project for avoiding the deviation