According to the PMBOK® Guide and the Standard for Project Management, the entity described is the Change Control Board (CCB). This body is a formally constituted group responsible for the Perform Integrated Change Control process.

The specific roles and responsibilities of the CCB as defined in PMI study guides include:

Reviewing and Evaluating: Analyzing Change Requests (CRs) for their impact on project constraints such as scope, schedule, cost, and quality.

Decision Making: Approving, delaying (deferring), or rejecting changes to the project.

Recording and Communicating: Ensuring that all decisions are documented in the Change Log and communicated to the relevant stakeholders to ensure alignment.

The other options are incorrect based on the following PMI definitions:

Project Team: This group is responsible for performing the project work to achieve project objectives. While they may request changes or provide technical input on a change ' s impact, they do not hold the formal authority to approve or reject them against the baseline.

Focus Group: This is a data-gathering technique used in the Collect Requirements process. It brings together prequalified stakeholders and subject matter experts to learn about their expectations and attitudes about a proposed product or service.

Project Stakeholders: This is a broad term for any individual, group, or organization that may affect, be affected by, or perceive itself to be affected by a decision, activity, or outcome of a project. While the CCB is composed of stakeholders, the general stakeholder population does not manage the formal change control process.

As per the PMI Lexicon of Project Management Terms, the CCB’s authority is defined within the Change Management Plan, which is a subsidiary component of the Project Management Plan.