[多选]
Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)

A . offset the OADM loss at site b
B . overcome the high multiplexer loss at site a
C . amplify signal levels after the high loss through Fiber Span 1
D . adjust add channels at site B to be at the same level as the passthrough channels
E . ensure that the per channel power is higher than the minimum needed for the post-amp at Site

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Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)

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[多选] Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)

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[多选]
Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)