In the context of project management, particularly when a project is in the execution phase and the client's engagement levels have changed, it is crucial to maintain open communication and collaboration. Discussing the requested changes with the client ensures that their needs are understood and considered. This collaborative approach aligns with the PMBOKGuide's emphasis on stakeholder engagement as a key aspect of project management. It is important to involve stakeholders, especially clients, in decisions that affect the project scope and outcomes. By jointly reviewing the changes, the project manager can work with the client to assess the impact on the project's objectives, timeline, and budget, and make informed decisions that align with the project's goals and the client's expectations.
: The approach of discussing changes with the client is supported by the PMBOKGuide, which outlines the importance of stakeholder engagement and collaboration in project management1. Additionally, the Professional in Business Analysis Reference Materials emphasize the role of business analysis in understanding stakeholder needs and facilitating effective communication between stakeholders and the project team2.

The project manager should compare the achieved results to the contract requirements before obtaining financial, legal, and administrative approval to close the project and transfer the liability. This is because the project manager needs to ensure that the supplier has fulfilled all the contractual obligations and delivered the agreed scope, quality, and performance standards. The project manager should also verify that the supplier has completed all the required documentation, testing, training, and warranty services. The project manager should also review the lessons learned, feedback, and satisfaction surveys from the supplier and the project team. This will help the project manager evaluate the supplier's performance, identify any issues or disputes, and resolve them before making the final payment and closing the project. The project manager should also communicate with the supplier and the relevant stakeholders about the project closure and the transfer of liability. References: (Professional in Business Analysis Reference Materials source and documents) PMBOK Guide, 6th edition, Section 12.3.1, "Close Procurements: Inputs" PMBOK Guide, 6th edition, Section 12.3.2, "Close Procurements: Tools and Techniques" PMBOK Guide, 6th edition, Section 12.3.3, "Close Procurements: Outputs" PMI-PBA Guide, 1st edition, Section 6.4.1, "Evaluate Solution: Inputs" PMI-PBA Guide, 1st edition, Section 6.4.2, "Evaluate Solution: Tools and Techniques" PMI-PBA Guide, 1st edition, Section 6.4.3, "Evaluate Solution: Outputs"

Agile promotes continuous improvement and collaboration. However, if a new process affects key stakeholders outside the development team (in this case, the business), then alignment is required. The project manager should engage the business manager and discuss the proposed approach and its benefits to secure approval.
The Agile Practice Guide supports direct stakeholder engagement when process changes affect external contributors or consumers of deliverables. Agility includes openness to improvement, but also emphasizes communication and stakeholder buy-in.
Option B (PMO) may help, but the business manager is the decision-maker.
Option C delays potential value.
Option D ignores required alignment with business stakeholders.
References:
Agile Practice Guide, Chapter 3 - Tailoring and Stakeholder Collaboration PMBOK Guide - Seventh Edition, Stakeholder Performance Domain
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According to the PMBOK Guide, 7th edition, a joint requirements session is a technique used to elicit and prioritize requirements from multiple stakeholders in a collaborative and interactive way. It can also be called a workshop, a focus group, or a brainstorming session. To ensure that the session is effective and efficient, the project manager should organize a formal session led by a skilled facilitator who can guide the discussion, manage conflicts, and ensure participation from all attendees. The facilitator should also establish and communicate the rules for how the participants will interact with one another, such as respecting different opinions, using constructive feedback, and following an agenda. This will help to avoid chaos and confusion, and to achieve the desired outcomes of the session. References:
PMBOK Guide, 7th edition, page 149, section 5.2.3.1, Joint Requirements Session PMBOK Guide, 7th edition, page 150, section 5.2.3.2, Facilitation

Conflict management is a crucial part of project management. When a project manager faces a conflict with a project sponsor, it's important to negotiate and develop a mutually beneficial solution12. This involves clear communication, active listening, and negotiation skills1. The project manager should try to reach a compromise where both parties may have to make concessions1. Rather than viewing the problem as a disagreement between two parties, it can be helpful to view it as a common issue and work together to resolve it1. This approach fosters collaboration and leads to a win-win outcome1. References: 12
https://www.pmi.org/learning/library/understanding-managing-conflict-resolution-strategies-6484