A transformation project that is composed of agile streams has come to an end.

Comprehensive and Detailed Explanation:

At the close of a project, especially one involving multiple agile streams, the best practice is to conduct a formal lessons learned session (also known as a retrospective or post-mortem). This allows comprehensive collection of what went well, what didn’t, and how to improve future projects.

* B is limited to only one sprint.

* C is not the appropriate forum for final reflections.

* D may provide leadership insights but not team-level experience.