单选题Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）AThe ERX router sends an Active Discovery Offer message.BThe ERX router sends an Active Discovery Initiation message.CThe customer device sends an Active Discovery Offer message.DThe customer device sends an Active Discovery Initiation message
单选题
Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）
A
The ERX router sends an Active Discovery Offer message.
B
The ERX router sends an Active Discovery Initiation message.
C
The customer device sends an Active Discovery Offer message.
D
The customer device sends an Active Discovery Initiation message
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