You are provisioning a new customer for access to your Layer 3 VPN. The customer is using 172.16.35.0/24 as their internal IP address space, which is also being used by an existing Layer 3 VPN customer. The two customers share many PE routers in common across your network.
Which mechanism allows these duplicate addresses to exist in your network?
A . route origin
B . route target
C . route refresh
D . route distinguisher
Answer: D