单选题What is the purpose of Dual Ring Interconnect with D C for SDH rings？（）AProtects signals when a ring switch failsBProtects signals when multiple span switches failCProtects pre-emptible traffic from being dropped when a ring switch occursDProtects signals against any combination of link failure in each ring
单选题
What is the purpose of Dual Ring Interconnect with D C for SDH rings？（）
A
Protects signals when a ring switch fails
B
Protects signals when multiple span switches fail
C
Protects pre-emptible traffic from being dropped when a ring switch occurs
D
Protects signals against any combination of link failure in each ring
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