In the path search process of the U2000 network management, the path search management module first scans the cross-connections of each network element, constructs sub-paths according to the cross-connections of adjacent network elements, and tries to merge these sub-paths at the same time. Which of the following sub-paths is legal?

In the path search process of the U2000 network management, the path search management module first scans the cross-connections of each network element, constructs sub-paths according to the cross-connections of adjacent network elements, and tries to merge these sub-paths at the same time. Which of the following sub-paths is legal?
A . Subpaths form a loop
B. The path does not pass through the fiber
C. The original destination is not the end point of the subpath or the optical port of the subnet
D. The sub-path terminates on the pre-configured network element

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Answer: D