You are managing a 24*7 database. The

You are managing a 24*7 database. The backup strategy for the database is to perform user-managedbackups.Identify two prerequisites to perform the backups. (Choose two.)（）

• A The database must be opened in restricted mode.
• B The database must be configured to run in ARCHIVELOG mode.
• C The tablespaces are required to be in backup mode before taking the backup.
• D The tablespaces are required to be in read-only mode before taking the backu