Which mechanism allows these duplicate addresses to exist in your network?

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