The default configuration for automatic database backups in OCI (e.g., Autonomous Database) includes "Backups occur weekly" (A), with daily incremental and weekly full backups. "Archive redo log files are backed up every 30 minutes" (B) is not default (it’s real-time logging), "Retention period is set at 14 days" (C) is incorrect (default is 60 days), and "Backups are executed on primary site" (D) is vague but not a standard config statement. Oracle’s backup documentation specifies weekly full backups as default.