Answer should be AD
Why C is incorrect:
When the database instance starts, the database automatically selects the first available undo tablespace. If no undo tablespace is available, then the instance starts without an undo tablespace and stores undo records in the SYSTEM tablespace
https://docs.oracle.com/en/database/oracle/oracle-database/21/admin/managing-undo.html#GUID-281C5BFE-BAED-47C3-BFF7-806C0954F3EC
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1 month, 3 weeks ago