In a scenario in which a backdoor link is used to connect two CE routers using EIGRP between them and the Layer 3 MPLS VPN provider as a PE-CE routing protocol, which BGP attribute can be used to avoid using the backdoor link as the preferred path?

In a scenario in which a backdoor link is used to connect two CE routers using EIGRP between them and the Layer 3 MPLS VPN provider as a PE-CE routing protocol, which BGP attribute can be used to avoid using the backdoor link as the preferred path?
A . AS path
B . Origin
C . Cost community
D . Extent community

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Answer: C