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A Cumulative Flow Diagram (CFD) displays the count of work items in each workflow state over time, revealing WIP levels, arrival and departure rates, and queue buildups that indicate bottlenecks. Stable, parallel bands suggest predictable flow; widening of a band highlights accumulation in that state and prompts investigation. Burndown charts (Option A) show remaining work in a timebox but do not expose per-state accumulation or systemic bottlenecks. Velocity charts (Option C) summarize completed work per iteration, useful for forecasting but not diagnosing flow constraints. A product roadmap (Option D) communicates sequencing and releases at a higher level rather than operational flow. CAPM agile objectives emphasize limiting WIP, managing cycle time, and using empirical data to improve throughput. Teams can combine CFD insights with explicit WIP limits and policies to balance demand and capacity, then run small experiments (e.g., adjust WIP limits, rebalance skills, address blockers) and measure impacts on lead and cycle times. This fosters continuous improvement and predictable delivery, aligning with agile principles and stakeholder expectations.