ABF are correct. Easier to say why the others are incorrect.
C - Flashback is a logical tool. It cannot repair a physical error.
D - incorrect. RMAN cannot always repair corrupt blocks, for example - a DB in noarchivelog mode....
E - ADR is an offline, file based, utility. It does not exist within the DB itself.
ABF,
AB:
https://oracle-base.com/articles/11g/automatic-diagnostics-repository-11gr1
F:
Failures are normally detected reactively. A database operation involving corrupted data results in an error, which automatically invokes a data integrity check that searches the database for failures related to the error. If failures are diagnosed, then they are recorded in the Automatic Diagnostic Repository (ADR), which is a directory structure stored outside of the database. You can use Data Recovery Advisor to generate repair advice and repair failures only after failures have been detected by the database and stored in ADR.
C- incorrect only logical
D- incorrect sometimes dont have enought backups to repair
E Incorrect - only file repository.
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