Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)

Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)
A . Meet the transmission bandwidth requirements of each optical Tb/s through the wavelength division function
B. Provide 2.7G b /s, 10.7G b /s, 43G b /s and even 111.8G b /s high-speed interface
C. Provide up to 5 levels of nested overlapping TCM connection monitoring
D. Support virtual concatenation transmission mode to improve and optimize the network structure
E. Provide a powerful out-of-band FEC function, which effectively guarantees the line transmission performance

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Answer: ABDE