You are performing a BGP design review for a service provider that offers MPLS-based services to their end customers. The network is comprised of several PE routers that run iBGP with a pair of route reflectors for all BGP address families. Which two options about the use of Constrained Route Distribution for BGP/MPLS VPNs are true? (Choose two.)
A. This feature must be enabled on all devices in the network at the same time.
B. The RR must advertise the default route target filter toward the PE routers.
C. The RRs do not need to advertise any route target filter toward the PE routers.
D. Both PE and RR routers must support this feature.
