Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?

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.

Explanation: