A Tier-3 Service Provider is evolving into a Tier-2 Service Provider due to the amount of Enterprise business it is receiving. The network engineers are re-evaluating their IP/MPLS design considerations in order to support duplicate/overlapping IP addressing from their Enterprise customers within each Layer 3 VPN. Which of the following would need to be reviewed to ensure stability in their network?
A. Assigning unique Route Target ID’s
B. Assigning unique Route Distinguishers
C. Assigning unique IP address space for the Enterprise NAT/Firewalls
D. Assigning unique VRF ID’s to each Layer 3 VPN
