Which of the following commissioning ranges should the optical power of each single wave before combining (that is, the input optical power of the combining board) be within?

Which of the following commissioning ranges should the optical power of each single wave before combining (that is, the input optical power of the combining board) be within?
A . Average single-wave optical power- 2dB<single-wave optical power<average single-wave optical power+ 3dB
B. Average single-wave optical power- 1dB<single-wave optical power<average single-wave optical power+ 2dB
C. Average single-wave optical power- 1dB<single-wave optical power<average single-wave optical power+ 3dB
D. Average single-wave optical power- 2dB < single-wave optical power<average single-wave optical power+2dB

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Answer: D