I believe that C and F are corrects.
Core network design
This section describes two common core network deployment scenarios – dual-stack deployment where the network runs IPv4 and IPv6 concurrently, and 6PE/6VPE deployment where IPv6 becomes yet another application running on top of the existing MPLS core network.
https://www.ipspace.net/Service_Provider_IPv6_Introduction
After some investigations now I think correct answers are B C.
"Pv6 Rapid Deployment (6rd) (RFC 5969) 6rd is a stateless tunneling mechanism which allows an Service Provider to rapidly deploy IPv6 in a lightweight and secure manner without requiring upgrades to existing IPv4 access network infrastructure."
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6-solution/whitepaper_c11-665758.html
"The IPv6 over MPLS: 6PE and 6VPE feature enables the service providers running an MPLS/IPv4 infrastructure to offer IPv6 services without any major changes in the infrastructure."
https://www.cisco.com/c/en/us/td/docs/wireless/asr_901s/scg/b_scg_for_asr901s/b_scg_for_asr901s_chapter_0100001.html
BF
http://www.fastlaneus.com/blog/2011/08/19/transition-to-ipv6-at-the-service-providers-nat64-6rd-ds-lite-6pe-6vpe-and-carrier-grade-ipv6-cgv6/
E - not appropriate, it is ipv4 in ipv6 tunnel
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