The following description of discrete services, which are correct? (Multiple choice)

The following description of discrete services, which are correct? (Multiple choice)
A . For a cross-connection, after the path search, it is either a discrete service or a path with other cross-connections, it is impossible to belong to both high-spread services and other cross-connections to form a path.
B . Perform path search on the U2000 network management. Cross-connections that do not form a path are called discrete services.
C . Discrete service management requires the U2000 license to have path management functions.
D . A service is searched for a discrete service, indicating that the service is not working properly on the network element side.

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Answer: ABC