A. For Sprints that require Nicole's expertise for more than one team, combine the teams into one and separate when they no longer need to share her services.

B. Investigate whether applying additional techniques or frameworks for scaling Scrum would be appropriate for this product team in the future, since you have multiple Scrum Teams working on the same product, with dependencies between the teams.

C. People from the Development Teams with an interest in Nicole's domain could volunteer to take on this work in their respective teams.

D. Ask Nicole for a plan to hire and train additional people in her domain, and in the meantime work with the Product Owner and Development Teams to re-prioritize the work so that tasks not depending on Nicole can be done first.

E. Have the Development Team re-order the Product Backlog so Nicole can serve one team full-time in a Sprint.

F. Create a team with Nicole and people from the teams to temporarily work in Nicole's domain to serve the existing teams.