After a change request is approved, a vendor shares the estimated delivery date with project management. A key stakeholder requests to have this change completed by an earlier date. Which of the following is the BEST action for the project manager to take?

A. Negotiate with the vendor to complete the change earlier.
B. Evaluate the impact of switching tasks on the schedule.
C. Consult with the CCB about the request.
D. Confront the stakeholder about the unrealistic request.