Which three statements about DWDM are true? (Choose three)

Which three statements about DWDM are true? (Choose three)
A . It allows a single strand of fiber to support bidirectional communications
B . It is used for long-distance and submarine cable systems
C . It can multiplex up to 256 channels on a single fiber
D . It supports both the SDH and SONET standards
E . Each channel can carry up to a 1-Gbps signal
F . It supports simplex communications over multiple strands of fiber

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Answer: ABD