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What are three benefits of performing data definition language （DDL） statements against a partitioned table with the UPDATE GLOBAL INDEXES clause？（）
A:Global indexes are rebuilt automatically at the end of the DDL operation thereby avoiding problems with the UNUSABLE status. 
B:You do not have to search for invalid global indexes after the DDL command completes and rebuild them individually. 
C:Global indexes are maintained during the operation of the DDL command and therefore can be used by any concurrent query. 
D:Global indexes remain intact and available for use by data manipulation language （DML） statements even for sessions that have not enabled the skipping of unusable indexes.

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出自：Oracle认证

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