In user-managed backup and recover procedures， how are data files backed up？ （）A、Using SQL commands.B、Using SQL*Plus commands.C、Using operating system commands.D、Using Recover Manager commands.
In user-managed backup and recover procedures， how are data files backed up？ （）
- A、Using SQL commands.
- B、Using SQL*Plus commands.
- C、Using operating system commands.
- D、Using Recover Manager commands.
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