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 backu