In FusionInsight HD, regarding the secondary development of Hive UDF, which of the following descriptions is correct? (multiple choice)

In FusionInsight HD, regarding the secondary development of Hive UDF, which of the following descriptions is correct? (multiple choice)
A . Before the user-defined UDF is used, it needs to be created in the Hive system.
B . User-defined UDF is not allowed to add information such as summary and status.
C . User-defined UDF can add deterministic and statefull annotations according to the actual situation.
D . In a secure cluster, user-defined UDFs are recommended to be created before each use.

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Answer: AC