While expanding the existing network wave distribution system, which of the following performances do not need to be evaluated?

While expanding the existing network wave distribution system, which of the following performances do not need to be evaluated?
A . PMD parameters of the link
B . Optical power of OTU/OA
C . BER of OTU before error correction at the receiving end
D . Optical power flatness at the receiving end (with MCA)

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Answer: A