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Which three statements are true about using flashback database in a multitenant container database(CDB)?（）
A:The root container can be flashed back without flashing back the pluggable databases (PDBs).
B:To enable flashback database, the CDB must be mounted.
C:Individual PDBs can be flashed back without flashing back the entire cdb.
D:The DB_FLASHBACK RETENTION_TARGET parameter must be set to enable flashback of the cdb.
E:A CDB can be flashed back specifying the desired target point in time or an SCN, but not a restore point.

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出自：Oracle认证

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