All team members on a new project want to gain the trust of the customer by delivering value as quickly as possible. The project manager learns that one res ource has worked with the sponsor on other projects. The resource seems to be using personal influence, working with a project sponsor to increase project benefits realization. At which stage in the project should the project manager address this concern t o optimize cost effectiveness?

A. At the start of the team's performing stage

B. Immediately after the first benefit realization

C. During the next retrospective ceremony

D. During the next resource performance review