Which two statements are true about the Automatic Diagnostic Repository （ADR）？（）
- A The ADR base keeps all diagnostic information in binary format
- B SQL*Plus provides the ADRI script， which can be used to work with ADR
- C The ADR can be used for problem diagnosis only when the database is open
- D The ADR can be disabled by settting the DIAGNOSTIC_DEST parameter to null
- E The ADR can be used for problem diagnosis even when the database instance is down
- F The ADR base is shared across multiple instance