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

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.

Explanation:
Reference: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-over_mpls.pdf