A project manager has received numerous complaints from staff concerning poor service provided by a vendor.
Which of the following steps should the project manager take FIRST to correct the problem?

A. Review the SOW with the vendor and terminate the vendor
B. Notify the key stakeholders of the problem and send a C&D letter to the vendor
C. Notify the vendor of the complaints and review the SLA with the vendor
D. Review the acceptable use policy with the vendor before requesting termination of the vendor's employee.