In an Agile context, the servant leader's role is to support the team and help them perform their tasks in a self-organized way12. When a deliverable that needs to be certified by another team is not taken for many months, it creates an impediment to the team's progress. The servant leader should review the process and work to remove this impediment12. This could involve facilitating communication between the two teams, adjusting the process to prevent such delays in the future, or finding alternative solutions that allow the team to continue their work effectively12. References: 12
https://www.agile-academy.com/en/scrum-master/servant-leadership-how-does-leadership-work-in-an-agile-con

When new regulations are implemented that affect a project's scope, it is essential for the project manager to perform an impact analysis. This analysis will determine the extent of changes needed to comply with the regulations and how these changes will affect the project's cost, schedule, quality, and other critical factors.
The PMBOKGuide highlights the importance of assessing changes and determining their impact on the project plan. It is not sufficient to simply continue with the existing governance policy or directly comply without understanding the implications. Escalating the issue to upper management without first analyzing the impact may lead to decisions that are not aligned with the project's best interests.
References: =
* Project Management Institute. (2017). A Guide to the Project Management Body of Knowledge (PMBOKGuide) - Sixth Edition.
* Project Management Articles. (2023). 5 Phases of Project Management Life Cycle | Complete Guide1.
* Project Governance Critical Success | PMI2.

Explanation
The project manager should ask the team member to provide details to address the issue with the vendor, as this is one of the best practices for managing external dependencies in an agile project. According to the Agile Practice Guide, the project manager should collaborate with the team members and the vendors to identify, monitor, and resolve any issues or risks that may affect the project delivery. The project manager should also establish clear and frequent communication channels with the vendors and ensure that they are aligned with the project vision, goals, and expectations. Implementing fast tracking to reduce the impact of the delay on the sprint (A) is not a good option, as it may increase the risk and complexity of the project and compromise the quality and value of the deliverables. Updating the communications management plan to prevent future reoccurrence is not enough, as it does not address the current issue and the possible solutions. Asking the team member to resolve the issue independently to minimize further delays (D) is not advisable, as it may create silos and conflicts within the team and with the vendor, and reduce the collaboration and transparency that are essential for agile project management. References: Agile Practice Guide, pages 43-44, 77-78; PMP Examination Content Outline, pages 9-10, 13-14.