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單項選擇題

Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards, the exhibit shows your configuration in a local switch1. However, EtherChannel is not coming up. Which one of these statements could be a possible reason?()

A. EtherChannel is only available in Cisco equipment. 
B. The customer side is supposed to be running PAgP, which is a Cisco standard. 
C. PAgP is not an IEEE standard. VRRP should be used. 
D. The configuration on switch1 needs to be modified to use LACP. 

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