A Servant Leader is one who focuses primarily on the growth and well-being of people and the communities to which they belong. The servant-leader shares power, puts the needs of others first and helps people develop and perform as highly as possible. In the context of this question, a Servant Leader would work to ensure that the team has all the resources and knowledge they need to define the steps and identify the risks of migrating data to a new system1.
References: Essential Leadership Skills for Project Managers

When a project manager realizes that some stakeholders are working against the success targets of the project, it's important to engage all stakeholders, including the unsupportive ones. This is because every stakeholder has a role to play in the project, and their concerns need to be addressed for the project to succeed.
The project manager should also update the project stakeholder analysis and methods to satisfy the stakeholders' requirements. This involves identifying the needs and expectations of the stakeholders and developing strategies to meet them. By doing so, the project manager can ensure that the stakeholders are satisfied and that their concerns are addressed, which can lead to their support for the project.
While escalating the issue to the functional manager (option B), involving all stakeholders by distributing status reports (option C), and focusing on the supportive stakeholders (option D) might be part of the subsequent actions, the immediate steps should be to engage all stakeholders and update the stakeholder analysis and methods.
: Project Management Body of Knowledge (PMBOK) Guide, 6th Edition, Section 13: Stakeholder Management.

When a project is experiencing roadblocks, especially when similar issues have occurred in past projects, it is crucial to review and improve the processes being used. The PMBOK Guide emphasizes the importance of monitoring and controlling project work to meet performance objectives, and this includes making necessary changes to project processes to enhance efficiency and effectiveness1. In this scenario, since the team is following the processes exactly, it indicates that the processes themselves may be contributing to the delays.
Therefore, the project manager should analyze the current processes, identify non-value-adding activities, and seek to eliminate or improve them to overcome the roadblocks and get the project back on track. This approach aligns with the principles of process improvement and value addition, which are central to both Project Management and Business Analysis practices2.
References:
* PMBOK Guide, 6th Edition, Project Management Institute.
* Business Process Analyst: Roles, Duties & Career Guide, Adaptive US Inc.

In a hybrid project management approach, which combines elements of both traditional and agile methodologies, it is essential to address quality issues promptly to minimize their impact on the project timeline and budget. The agile aspect of the hybrid approach emphasizes continuous improvement, team collaboration, and adaptability. Therefore, addressing quality issues during the next sprint planning meeting allows the project team to discuss and implement corrective actions swiftly. This aligns with the agile principle of inspecting and adapting, where the team reflects on how to become more effective and adjusts its behavior accordingly.
PMBOK Guide - Sixth Edition and Agile Practice Guide
The PMI Guide to Business Analysis
Project Quality Management According to the PMBOK

According to the PBA Guide, the project manager should facilitate the resolution of issues and conflicts that arise during the project, such as interruptions and requests for help from other teams1. This involves identifying the root causes of the problem, such as unclear roles and responsibilities, competing priorities, or lack of communication2. The project manager should then define the ground rules with all project team members to minimize interferences, such as setting boundaries for availability, delegating tasks, or using technology to avoid distractions34. This is also consistent with the PMBOK Guide, which states that the project manager should establish the team ground rules as part of the team development process5. By identifying the problem's root causes and defining the ground rules, the project manager can help the project team members avoid interruptions and requests for help from other teams, and focus on completing their tasks during the iterations. References:
* 1: PBA Guide, Chapter 3, Section 3.4.3, Page 66
* 2: PBA Guide, Chapter 3, Section 3.4.3.1, Page 67
* 3: A Plan for Managing (Constant) Interruptions at Work
* 4: 6 Secrets for Avoiding Interruptions at Work
* 5: PMBOK Guide, Chapter 9, Section 9.3.2.3, Page 318