Under the ADM configuration in the STM-16 level two-fiber bidirectional multiplex section shared protection ring, which of the following is the service protection situation?

Under the ADM configuration in the STM-16 level two-fiber bidirectional multiplex section shared protection ring, which of the following is the service protection situation?
A . The two circuit boards back up each other
B . Half the capacity in one board is used to protect half the capacity in the other board
C . Two circuit boards, one main and one backup
D . The two circuit boards have nothing to do with each other

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Answer: B