Which of the following statements is correct regarding online Oracle database backups? Please choose the correct answer.

Which of the following statements is correct regarding online Oracle database backups? Please choose the correct answer.
A . The database must be running in archivelog mode.
B . The database does not write to online redo log files during online backups.
C . Online database backups are not supported by Oracle.
D . A complete online backup consists of tablespace data files and the control file, all of which are necessary for restoring the database to a consistent state.
E . Users may only read data and may not enter data while the backup is running.

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Answer: A