What are two characteristics of relationships? (Choose two.)

A. Relationships will query every table in a data model regardless of whether the fields are in the visualization.

B. Relationships will query only the tables and fields needed to create a visualization.

C. Relationships are only supported when using extracts.

D. Relationships are aware automatically of the native level of detail of logical tables.

Explanation:
Only query data from tables with fields used in the current viz.
Support scenarios that require a single table of data, such as extract filters and aggregation.

Reference: https://help.tableau.com/current/online/en-us/datasource_relationships_learnmorepage.htm