The project manager received a claim from the client because the outcome delivered is not working properly. The project manager investigated the cause and realized that this deliverable was…

The communications management plan defines *how* project information will be exchanged, but it does not primarily identify *who* all the external providers or key stakeholders are in the first place.

The scope baseline defines what work is included in the project, but it typically doesn't detail the specific organizational units or external entities performing each piece of the work.

A risk register would document potential risks, possibly including those related to outsourcing, but it's a tool for risk planning and tracking, not the primary document for simply identifying *who* is performing specific outsourced work.

The stakeholder register is a project document that identifies all individuals, groups, or organizations that could affect or be affected by the project, including external providers and contractors. If properly maintained, it would have explicitly listed the external entity responsible for the outsourced deliverable, ensuring the project manager was aware of their involvement and responsibilities.