How do you handle hierarchical data in a report (parent-child relationships)?

How do you handle hierarchical data in a report (parent-child relationships)?

• A. Use data source relationships to join parent and child records and present them in grouped or nested layouts.
• B. Flatten all records into a single table.
• C. Use a random sampling of child records.
• D. Ignore parent-child relations and treat as flat data.

Answer: (C)