Which of the following may cause generation of discrete services in an NG-SDH system?

Which of the following may cause generation of discrete services in an NG-SDH system?
A . Trail query conditions are not met. For example, the fiber connections created on the NMS are inconsistent with the actual fiber connections.
B . Trail query restrictions exist. For example, among the multiple sources and sinks of a VC~4 service trail, some are outbound optical ports, and the others are non-outbound optical or electrical ports.
C . Cross-connection configurations are incomplete or incorrect.
D . Outgoing services exist.
E . The service trails created in an end-to-end manner is not activated on the NM

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Answer: ABCD