What is the best solution to ensure compliance with this new policy?

A company’s corporate policy has been updated to require that stateless, 1-to-1, and IPv6 to IPv6 translations at the Internet edge are performed.

What is the best solution to ensure compliance with this new policy?
A . NAT64
B . NAT44
C . NATv6
D . NPTv4
E . NPTv6

Answer: E

Explanation:

NPTv6 provides a mechanism to translate the private internal organization prefixes to public globally reachable addresses. The translation mechanism is stateless and provides a 1:1 relationship between the internal addresses and external addresses. The use cases for NPTv6 outlined in the RFC include peering with partner networks, multi homing, and redundancy and load sharing.

Reference: http://www.cisco.com/c/dam/en/us/td/docs/solutions/SBA/August2012/ Cisco_SBA_BN_IPv6AddressingGuide-Aug2012.pdf