Which command is essential for filtering a dataset based on a specific role in Power BI?

The command that is essential for filtering a dataset based on a specific role in Power BI is associated with testing the implementation of security roles. In Power BI, the "Test as Role" feature allows users to simulate the view of the report with different roles and understand how data will be filtered based on the defined role.

Using this command, you can verify that the role-based security settings are working as intended before publishing the report. It provides immediate feedback on how users assigned to various roles will see the data, which is crucial for ensuring that data governance policies are enforced appropriately.

Other commands related to role management—such as applying, modifying, or deleting roles—have different purposes. "Apply Role" would be used to designate a specific role for a user but does not filter data on its own. "Modify Role" allows changes to be made to existing roles, while "Delete Role" removes a role altogether. However, these actions do not facilitate immediate testing or validation of how data is filtered based on specific roles in the dataset. Therefore, the ability to test a role is fundamental for ensuring accurate data visibility according to user permissions.