You are working on a 24X7 datab

单项选择题 You are working on a 24X7 database. You want to design a backup strategy for your database that uses user managed backups. You want to be able to perform all backups while the database remains online. Which statement about performing user-managed backups in a 24x7 environment is true?（）: A、You must have change tracking enabled in your database; B、Your database must be running in NOARCHIVELOG mode; C、To back up a tablespace, it must be in backup mode; D、To back up a tablespace, it must first be taken offline

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