In a stakeholder meeting, a known disruptive stakeholder questions the project manager's authority to implement new processes for functional managers. What should the project manager do?

The project charter formally authorizes the project and the project manager, granting them the authority to apply organizational resources to project activities. By referring to the approved project charter, the project manager can clearly demonstrate the basis of their authority to implement new processes, as these would typically be outlined or implied within the project's scope and objectives. Referring to the change management plan is incorrect because the issue is about the project manager's authority, not the specifics of the change process itself. Meeting privately with the stakeholder might be necessary later, but first, the project manager should assert their authority using an official document. Explaining risk management is irrelevant to the immediate challenge of authority.