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Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（）
A: Archive log generation is suspended until the tablespaces are taken out of hot backup mode. 
B: Datafiles are not written to during hot backups.
C: Changes to the database are cached during the backup and not written to the datafiles to ensure that the datafiles are consistent when recovered.
D: The datafile headers are not updated during the backup.
E: The way data is written to the online redo logs is unchanged during the backup.

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出自：Oracle认证

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