How many cluster visualization widgets can be on a dashboard at one time?

The correct answer is that only one cluster visualization widget can be on a dashboard at one time. This limitation is in place to ensure clarity and usability within the dashboard environment. When only one cluster visualization widget is available, it allows users to focus on analyzing a single set of data clusters without confusion that might arise from multiple visualizations displayed simultaneously. This design decision helps prevent information overload and enhances the interpretability of data insights.

Other options imply varying capacities for the cluster visualization widgets, which are not supported. Having none would not fulfill a functional purpose, while multiple widgets could lead to visual clutter and reduce the effectiveness of the analysis. Thus, the restriction to just one is intentional and enhances the overall user experience in data analysis scenarios.