A project manager is assigned to a major system integration project that is currently in the execution phase. The project relies heavily on the presence and availability of certain products and services, which are provided at various periods throughout the project phases by selected third-party vendors. What should the project manager do to ensure the successful execution of the project? Activate the mitigation plan for the procurement risks Ask the procurement department to select the vendor using established processes Perform procurement control checks throughout the project Oversee the selection process for the vendor to procure the needed products and services