When the input optical power of the amplifier at the receiving end OAU is lower than the nominal optical power, which of the following are wrong in the operation?

When the input optical power of the amplifier at the receiving end OAU is lower than the nominal optical power, which of the following are wrong in the operation?
A . Adjust the dimmable fading before the terminating amplifier to increase the input optical power of the amplifier
B . Set the OAU gain so that its output reaches the nominal value
C . Improve the sending optical power of the originator
D . When the input optical power cannot be increased by adjusting the adjustable attenuator, the adjustable attenuation at the input of the amplifier is removed.

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Answer: C