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
Answer: ABD