You are the Scrum Master for four Scrum Teams working from the same Product Backlog.

B. Developers with an interest in Stella’s domain could volunteer to take on this work in their respective Scrum Teams.

This is a good solution because it is consistent with the Scrum value of commitment, which means that the Scrum Team members are willing to learn new skills and take on new challenges to deliver value12. By volunteering to take on this work, the Developers can reduce the dependency on Stella, increase their cross-functionality, and collaborate more effectively within and across the Scrum Teams34. F. Ask Stella for a plan to hire and train additional people in her domain, and in the meantime work with the Product Owner and Scrum Teams to re-prioritize the work so that tasks not depending on Stella can be done first

This is another good solution because it is consistent with the Scrum principle of empiricism, which means that the Scrum Team learns and adapts based on the actual outcomes and feedback, rather than following a predefined plan12. By asking Stella for a plan to hire and train additional people, the Scrum Master can help address the root cause of the dependency and create more capacity and diversity in Stella’s domain. By working with the Product Owner and Scrum Teams to re-prioritize the work, the Scrum Master can also help optimize the value and feasibility of the product backlog items, and enable the Scrum Teams to deliver valuable and functional increments every Sprint34. G. Create a team with Stella and identify people from the Scrum Teams to temporarily work in Stella’s domain to learn to better serve the existing teams

This is also a good solution because it is consistent with the Scrum value of respect, which means that the Scrum Team members appreciate and value eachother’s skills and perspectives12. By creating a team with Stella, the Scrum Master can acknowledge and leverage Stella’s expertise and experience in her domain. By identifying people from the Scrum Teams to temporarily work in Stella’s domain, theScrum Master can also facilitate knowledge transfer and skill development among the team members, which can improve their self-organization and collaboration34.

References: 1: Scrum Values | Scrum.org 2: Scrum Values - Atlassian 3: Scrum Guide | Scrum Guides 4: Scrum - What is it, how it works, & how to start - Atlassian