Adding relational items like Family will display documents in which visualization tool?

The selection of Cluster Visualization as the correct answer is based on the functionality and purpose of this particular visualization tool within the context of displaying relational items. Cluster Visualization is designed to show how different entities are connected or related to each other in a spatial format, which is particularly useful when depicting relationships, such as those of family members in a database.

Cluster Visualizations group related items together, allowing a user to see a clear and organized representation of these connections. When adding relational items like family members, this tool effectively illustrates the relationships within a network, making it easier to comprehend the dynamics and the connections among various documents or entities present in a dataset.

In contrast, other visualization tools serve different purposes. For example, Document List displays items in a straightforward, enumerated format, while Timeline Visualization focuses on chronological order, and Circle Pack Visualization arranges items in concentric circles based on their relationships but does not necessarily highlight connections in the same way Cluster Visualization does. Thus, Cluster Visualization is the most appropriate choice for depicting relational items like family.