The Identify Stakeholders process is a critical part of project management that aims to recognize all people or organizations involved in the project, documenting their interests, involvement, and potential impact on the project's success. The primary output of this process is the Stakeholder Register, which includes detailed information about the stakeholders. This register serves as a vital document for guiding the project manager and team in understanding stakeholder expectations and requirements. The other options, such as Scope Baseline, Project Charter, and Project Scope Statement, are outputs of different processes within project management.