In your multitenant container database (CDB) containing pluggable databases (PDB), users complain about performance degradation. How does real-time Automatic database Diagnostic Monitor (ADDM) check performance degradation and provide solutions?（）

• A、It collects data from SGA and compares it with a preserved snapshot.
• B、It collects data from SGA, analyzes it, and provides a report.
• C、It collects data from SGA and compares it with the latest snapshot.
• D、It collects data from both SGA and PGA, analyzes it, and provides a report