The advantages of WDM mainly include the following. (Multiple choice)

The advantages of WDM mainly include the following. (Multiple choice)
A . Large capacity, " transparent" transmission of data
B. The system is easy to upgrade, and the existing investment can be protected to the greatest extent when upgrading
C. Can fully replace SDH equipment
D. Compatible with future all-optical switching networks
E. High networking flexibility, economy and reliability

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Answer: ABDE