How can you configure this network so that customers can transparently extend their networks through the provider?

Refer to the exhibit.

How can you configure this network so that customers can transparently extend their networks through the provider?
A . Configure eBGP peering among the CE routers.
B . Configure EIGRP OTP on the CE routers.
C . Configure eBGP peering between the CE and PE routers.
D . Configure OSPF peering between the CE and PE routers.

Answer: B