In the Scaled Agile Framework (SAFe), Scrum Masters or Team Coaches (SM/TCs) support their teams by making work visible and ensuring transparency around progress and delivery. One of the most effective tools for visualizing team delivery is the Burn-up Chart.

A Burn-up Chart shows progress toward the completion of work over time. It tracks the amount of work completed compared to the total scope, helping teams and stakeholders visualize how close they are to meeting iteration or PI objectives. This visualization enables data-driven discussions, supports predictability, and helps identify delivery risks early.

While other metrics like Cycle Time or Cumulative Flow Diagrams are valuable for measuring flow and efficiency, the Burn-up Chart specifically visualizes delivery progress.

From SAFe guidance:

''Teams use burn-up charts to visualize progress toward the goal and communicate delivery status. They enable transparency and support empirical planning and adaptation.''

Therefore, the correct answer is B. Burn-up chart---it is the primary visualization tool for tracking and communicating team delivery progress.