多选题Which three are advantages of SONET？（）AAllows the transportation of all forms of trafficBMultiplexing is easyCClocks do not need to be synchronizedDReduces network complexity and costEPadding is not necessary and not permitted
多选题
Which three are advantages of SONET？（）
A
Allows the transportation of all forms of traffic
B
Multiplexing is easy
C
Clocks do not need to be synchronized
D
Reduces network complexity and cost
E
Padding is not necessary and not permitted
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