Which statement about implementing the Cisco IPv6 provider Edge Router over MPLS is true？（）

• A、6PE feature is supported over tunnels other than RSVP-TE tunnels
• B、Core MPLS routers are supporting IPv6 ONLY
• C、6PE feature is not supported over tunnels other than RSVP-TE tunnels
• D、Core MPLS routers are supporting IPv4 only