You are providing a design review for a service provider that offers MPLS Layer 3 VPN services. Which two considerations of using RT Constrained Route Distribution are true? (Choose two)

RRs must advertise the default Route Target filter toward PE routers for backward compatibility, so the claim that RRs do not need to advertise any RT filter is false.

It is the RR - not the PE - that advertises the default Route Target filter; PE routers advertise their specific RT membership to inform the RR which routes they need.

RT Constrained Route Distribution relies on BGP capability negotiation defined in RFC 4684, so both PE and RR routers must explicitly support the feature for the constrained advertisement mechanism to function correctly.

RT Constrained Route Distribution uses BGP capability negotiation, allowing incremental deployment; it does not require simultaneous enablement across all devices in the network.

The RR must advertise the default Route Target filter (RT 0:0) toward PE routers to ensure backward compatibility - this guarantees that PEs which do not support RT constraint still receive all VPN routes they require.