In a typical chained NG WDM network (such as A → B → C, A, B, and C are three sites), it is found that the official telephone number between the stations is not available during the commissioning. What are the possible reasons? (Multiple choice)

In a typical chained NG WDM network (such as A → B → C, A, B, and C are three sites), it is found that the official telephone number between the stations is not available during the commissioning. What are the possible reasons? (Multiple choice)
A . B station SC2 board is damaged
B . In the SC2 board configuration of station B, the configuration is incorrectly changed to "the official does not pass the optical port."
C . C station receiving direction OA board damage

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Answer: AB