In the ODN network, how large should the standard range of optical power attenuation in upstream and downstream be controlled?

In the ODN network, how large should the standard range of optical power attenuation in upstream and downstream be controlled?
A . 28.5db, 13db
B . 13db, 28.5db
C . 23db, 11db
D . 11db, 23db

Answer: B

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