单选题

In which situation is the UNDO_RETENTION parameter be ignored, even if it is set to a value()

AWhen the data file of the undo tablespace is autoextensible

BWhen there are more than one undo tablespaces available in the database

CWhen the undo tablespace is of a fixed size and retention guarantee is not enabled

DWhen the undo tablespace is autoextensible and retention guarantee is not enabled

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