Explanation
The project charter is a document that authorizes the project and defines the high-level scope, objectives, stakeholders, and constraints. It is created during the initiating phase of the project and provides the basis for stakeholder engagement. If a key stakeholder requests frequent changes to the project scope, the project manager should update the project charter accordingly and discuss it with the key stakeholder to ensure alignment and commitment. The other options are not appropriate in the initiating phase, as they involve more detailed planning or execution activities that should be done after the project charter is approved. References:
PMBOK Guide, 7th edition, page 30, 34, 80.