The stakeholder management plan is an input to management stakeholder engagements. This plan defines the needed levels of interactions of the project stakeholders. 1 is incorrect. The project charter authorizes the project and the project manager, but it doesn’t define the interactions among the project stakeholders. 2 is incorrect. The stakeholder registry defines the project stakeholders, their communication preferences, and project concerns. 4 is incorrect. The stakeholder management plan is part of the project’s management plan, but this isn’t the best answer for the question as the stakeholder management plan is most specific.