How does real-time Automatic database Diagnostic Monitor (ADDM) check performance degradation and provide solutions?

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 both SGA and PGA, analyzes it, and provides a report.

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 SGA and compares it with a preserved snapshot.