During an online database backup, which files must be saved to ensure that the Oracle database can be restored to an internally consistent state? Please choose the correct answer.

During an online database backup, which files must be saved to ensure that the Oracle database can be restored to an internally consistent state? Please choose the correct answer.
A . The tablespace data files, the database control file, and the database parameter file
B . Oracle online redo log files and the database control file
C . The Oracle executables, the database parameter file, and the tablespace data files
D . Tablespace data files, the database control file and all database redo logs written during the online backup

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Answer: B