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 autoextensibleBWhen there are more than one undo tablespaces available in the databaseCWhen the undo tablespace is of a fixed size and retention guarantee is not enabledDWhen the undo tablespace is autoextensible and retention guarantee is not enabled
单选题
In which situation is the UNDO_RETENTION parameter be ignored， even if it is set to a value（）
A
When the data file of the undo tablespace is autoextensible
B
When there are more than one undo tablespaces available in the database
C
When the undo tablespace is of a fixed size and retention guarantee is not enabled
D
When the undo tablespace is autoextensible and retention guarantee is not enabled
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