Correct Answer: B, C, EIn situations where an external specialist is required full-time, several approaches can be taken to address the issue and ensure the team continues to operate effectively. First, encouraging Developers with an interest in the specialist's domain to volunteer ensures knowledge transfer and reduces dependency on the specialist in the future. Secondly, asking for a plan to hire and train additional people in the specialist's domain, while reprioritizing the work to focus on tasks not dependent on the specialist in the short term, helps mitigate the immediate impact on productivity. Finally, creating a temporary team that includes the specialist and members from the Scrum Teams allows for immediate knowledge sharing and skill development, making the Scrum Teams more resilient and self-sufficient in the long run. These solutions collectively address both the immediate and longer-term challenges posed by the reliance on a specialist.