Site A business broadcasts to B station and C station. When the TOA (R8 version) of the bypass board of site A is connected to FE/GE, and GE uses TTT-GMP or GFP-T encapsulation, in order to make the switch station of site A up, what methods can be adopted on OTN equipment?

As shown below:

Site A business broadcasts to B station and C station. When the TOA (R8 version) of the bypass board of site A is connected to FE/GE, and GE uses TTT-GMP or GFP-T encapsulation, in order to make the switch station of site A up, what methods can be adopted on OTN equipment? (Multiple choice)
A . Configure the code stream type of TOA at Site A as "Null Code Stream"
B . Configure a unidirectional crossover from a bypass board to the circuit board at site B, and configure a unidirectional crossover from a circuit board to the bypass board at site A
C . Configure a one-way crossover from a circuit board to a bypass board at site A

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Answer: AB