The following is the part of the CORBA northbound interface and the corresponding function of each part, which is correct? (Multiple choice)

The following is the part of the CORBA northbound interface and the corresponding function of each part, which is correct? (Multiple choice)
A . CORBA name service; provides the only entry for OSS to correctly access the U2000 CORBA interface.
B . CORBA name service; when deploying, ensure that the name of the managed U2000 is unique within the NMS management domain.
C . CORBA notification service; converts OSS request information into internal interaction information of the U2000 system, and receives alerts/ performance/notifications.
D . CORBA notification service; when configuration data changes in U2000, it can timely inform the OSS of detailed change information. Ensure the consistency of OSS and U2000 data

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Answer: ABD