Which statement is true regarding dashboard prompts?

The statement regarding repository variables and session variables being usable in prompt default values is accurate. This feature allows for a more dynamic and personalized user experience in dashboarding tools. By utilizing these variables, prompts can adapt their default selections based on contextual data, user preferences, or system settings, enhancing the interactivity and relevance of the dashboard.

When creating prompts, incorporating session variables can lead to an immediate reflection of user-specific data, as they are unique to each session initiated by a user. Meanwhile, repository variables can provide universally applicable default values that facilitate standardized reporting processes across different users or sessions. Therefore, the use of these variables is crucial for creating flexible and context-aware prompt functionality in dashboards.

Regarding the other statements, while prompt values can indeed be limited based on specific requirements, and prompts can potentially include images, these features differ in scope and application compared to the use of variables. Additionally, the integration of multiple columns from different subject areas has specific constraints that may not apply universally depending on the data model's design and the dashboarding tool’s capabilities.