During the planning phase, the project manager estimates task durations based on the availability of the resources. How should the project manager gain commitment from the resources’ providers?
A、 Share the project management plan and human resource management plan to the functional manager.
B、 Send an e-mail to the staffing department with a completed resource request.
C、 Involve the functional managers in developing the plan and obtain their approval.
D、 Assure the functional managers that the resources will be released and completed.