Which of the following scenarios is suitable for the 1+1 protection method within the board?

Which of the following scenarios is suitable for the 1+1 protection method within the board?
A . Provides end-to-end protection for services and supports cross-subrack protection, which is suitable for scenarios with high reliability requirements.
B . Line-side optical cable protection, suitable for scenarios where the lengths of the main and backup optical cables differ greatly
C . End-to-end | +1 protection based on oDUk channel, suitable for branch line separation scenarios
D . Line-side optical cable protection, suitable for scenarios where the difference in length between the main and backup optical cables is small

Answer: A

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