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

• 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 backup