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You executed the following command in Recovery Manager （RMAN） to perform a backup of the DETTBS tablespace：  RMAN> BACKUP TABLESPACE DETTBS；  Under which conditions would this command execute successfully？ （）
A:The database is in NOMOUNT state.
B:The database is in ARCHIVELOG mode and the tablespace is online.
C:The database is in ARCHIVELOG mode and the tablespace is offline.
D:The database is in NOARCHIVELOG mode and the tablespace is online.
E:The database is in NOARCHIVELOG mode and the tablespace is offline.

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出自：Oracle认证

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