Explanation:

The best practice in project management, as per the PMP objectives, is to mitigate risks associated with resource availability by facilitating cross-functional knowledge transfer. This ensures that multiple team members are skilled in various components of the project, which allows for continuity of work in the event of an absence. The PMBOK Guide emphasizes the importance of knowledge transfer to enhance the team's ability to manage project risks and maintain productivity1.
= Project Management Professional (PMP) Reference Materials, particularly the sections on risk management strategies1, and the Professional in Business Analysis (PMI-PBA) Reference Materials, which discuss the knowledge areas relevant to risk mitigation and resource management23.

When managing a remote project team, it's crucial for the project manager to engage with the team to understand their specific needs and preferences regarding collaboration tools. This approach ensures that the tools selected are suitable for everyone and can facilitate effective communication and collaboration. It's important to recognize that while certain tools may have worked well in previous projects, they might not be the best fit for every team or project context. By involving the team in the decision-making process, the project manager can foster a sense of ownership and commitment to the project's success among team members1.
References:
PMI's guidance on collaborative tools emphasizes the importance of aligning tools with the team's needs and the project's requirements1.
The article "Project Collaboration: 6 Tips for Success" from Atlassian provides insights into the significance of choosing the right collaboration tools in consultation with the team2.
"4 Best Practices for Collaborative Project Management" from Mural highlights the need for empowering the team with the right tools for effective project collaboration3.

Comprehensive and Detailed Explanation:
Upon receiving quality concerns, the project manager should:
* B: Ask for additional data to assess the validity and scope of the defects.
* D: Continue testing per the plan to gather more data and not delay progress unnecessarily.
* E: Collaborate with the team to brainstorm root causes and next steps.
* A is too drastic without evidence.
* C may be premature if the issue can be handled by the team.
References:
PMBOK Guide - Seventh Edition, Quality and Team Performance Domains
Agile Practice Guide - Continuous Improvement and Inspection
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According to the PMBOK Guide, the product owner is the person responsible for defining and prioritizing the product backlog, and ensuring that the product delivers value to the customer and stakeholders1. The product owner also collaborates with the project team and the project manager to review the work in progress and provide feedback2. Therefore, if a stakeholder has a new requirement or a change request, the correct procedure is to provide it directly to the product owner, who will evaluate it and decide whether to add it to the product backlog or not. The other options are not the correct procedures for new requirements in a hybrid project. The change control board (CCB) is a group of stakeholders who review and approve change requests in a traditional project, but not in a hybrid project that follows agile principles3. The project sponsor is the person or group who provides the financial resources and support for the project, but not the owner of the product requirements or scope. The project manager is the person who leads the project team and manages the project work, but not the person who defines or prioritizes the product backlog. References:
* 1: PMBOK Guide, 6th edition, page 49
* 2: PMBOK Guide, 6th edition, page 50
* 3: PMBOK Guide, 6th edition, page 115
* : PMBOK Guide, 6th edition, page 33
* : PMBOK Guide, 6th edition, page 51