The following three optical layer protections have different protection ranges. Arrange them in ascending order. Which one is the correct one?

Question

Options

• AOptical line protection -> client side 1+1 protection -> intra-board 1+1 protection
• BIn-board 1+1 protection -> optical line protection -> client side 1+1 protection
• COptical line protection -> In-board 1+1 protection -> Client side 1+1 protection
• DIn-board 1+1 protection -> client side 1+1 protection -> optical line protection

• A
  2% (1)
• B
  9% (4)
• C
  84% (36)
• D
  5% (2)

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