The advantages of the SDH ultra-long-distance solution used in the power industry do not include ().

The advantages of the SDH ultra-long-distance solution used in the power industry do not include ().
A . Ultra-long distance capability
B . Leading
C . Unified network management of optical amplifiers and MSTP equipment
D . The optical amplifier system does not require additional network management channels
E . Supports amplification technologies such as Raman and remote pumping

Answer: D