Which statement is true regarding the retention policy for the incidents accumulated in the Automatic Diagnostic Repository （ADR）？（）  

• A、 The incident metadata is purged when the problem is resolved and the DBA closes the SR
• B、 The incident files and dumps are not retained in the ADR for the manually created incidents 
• C、 The incident files are retained but the incident metadata is purged when the problem is resolved and the DBA closes the SR
• D、 The default setting is for one year after which the incident metadata is purged from the ADR and the files are retained for one month