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