A project manager who uses a hybrid approach should be able to adapt to changes in the project environment and support the agile principles of delivering value to the customer and embracing change. As a servant leader, the project manager should empower the product owner to make decisions about the product backlog and prioritize the items that deliver the most value. Asking the sponsor to submit a change request to the CCB, accepting the request without consulting the product owner, or reviewing the impact of the change on the schedule management plan baseline are not appropriate actions for a project manager who uses a hybrid approach, as they imply a rigid and bureaucratic process that does not align with the agile mindset. References:
* PMBOK Guide, 6th edition, page 18
* Agile Practice Guide, page 13
* PMI-PBA Exam Content Outline, page 9
* [PMI-PBA Handbook], page 10

In a situation where the budget is very tight, the best course of action for a project manager is to continuously monitor the project's budget and anticipate potential issues. This proactive approach allows the project manager to identify and address any financial concerns early on, preventing them from escalating into more significant problems. It aligns with the PMBOK Guide's principles of cost management, which emphasize the importance of planning, estimating, budgeting, and controlling costs to ensure that the project can be completed within the approved budget1.
: PMBOK Guide - Sixth Edition and other standards within the Project Management Institute's foundational standards1.

When a project manager communicates the project management plan to the team, it's crucial to ensure that the communication is understood and to solicit feedback from the team12. This involves checking in regularly, listening actively, and inviting communication through multiple channels3. By confirming understanding and soliciting feedback, the project manager can identify and address any confusion or misunderstandings early on, ensuring that all team members are clear about their roles and the project schedule12. This approach helps to foster effective communication, enhance team collaboration, and contribute to the success of the project12. References: How to Create a Project Communication Plan (Template Included), How To Create A Project Communication Plan [+ Template], 9 Key Project Communication Strategies & How To Best Use Them, 10 Key Project Management Communication Strategies - ClearPoint Strategy

The project manager should try to understand why the customer is not clearing the packages for shipment and not participating in the communication calls. This could indicate a lack of interest, satisfaction, or trust in the project or the project team. The project manager should initiate a dialogue with the customer to address their concerns, expectations, and feedback, and to re-establish a positive relationship. This is part of the stakeholder engagement process, which aims to increase the support and minimize the resistance from the stakeholders throughout the project life cycle. The other options are not appropriate because they do not address the underlying problem and may worsen the situation. Requesting a change in the contract or a delivery date extension may create more conflict or confusion with the customer, and informing the customer that subsequent packages cannot be manufactured may jeopardize the project scope and quality. References:
PMBOK Guide 6th Edition, pages 513-514, 518-519, 524-525.