单选题
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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