With what feature is the downstream ethernet 1/1/9:1-1/1/9:4 command associated?

With what feature is the downstream ethernet 1/1/9:1-1/1/9:4 command associated?
A . Downlink Failure Detection
B . Uplink Failure Detection
C . Unidirectional Forwarding Detection
D . Bidirectional Forwarding Detection

Answer: B

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