In a project where different teams are using different approaches (predictive and agile), it's important to respect the methodologies that each team is comfortable with. Forcing a single approach could disrupt the workflow and productivity of the teams. Instead, allowing the teams to continue with their chosen approaches while gradually adapting to a hybrid model can provide a balance. This approach respects the existing workflows while moving towards a more unified project management approach. The hybrid model combines the strengths of both predictive and agile approaches, providing flexibility and adaptability while maintaining a level of predictability. References: PMBOKGuide - Sixth Edition and Agile Practice Guide (Page 27,
3.1.3 Tailoring Considerations for Knowledge Areas)

Explanation:

According to the PMBOK Guide, 6th edition, section 11.6.1.1, the project manager is responsible for monitoring and controlling the project risks and ensuring that the project objectives are met. The project manager should also identify and analyze any new or emerging risks that may affect the project performance or scope. In this scenario, the project manager should first work with the team and others in the network to assess and prioritize the obstacles. This will help to determine the impact and probability of each obstacle and decide on the best course of action to address them. The other options are either premature or inappropriate, as they do not address the root cause of the problem or respect the authority and responsibility of the project manager. References: PMBOK Guide, 6th edition, section 11.6.1.1, page 442.

When a customer requests additional functionality that risks the delivery date and conflicts with the agreed scope, the project manager should engage with the team to assess the effort required and then raise a change request. This process involves analyzing the impact of the change on project constraints and documenting the change request for further review by the Change Control Board (CCB). It is a structured approach that ensures any alterations to the project scope are carefully considered and approved before implementation, thus maintaining control over project outcomes.
: (PMBOK Guide's Change Management Process For PMP Certification1, Professional in Business Analysis Reference Materials | PMI2)