Which is one important advantage of using DS-Lite?
A. allow the service provider to rapidly deploy IPv6 in a lightweight and secure manner without requiring upgrades to the existing Ipv4 access networkinfrastructure.
B. ability to automate the address-family translation of IPv6 traffic over IPv4 network without requiring any manually mapping between IPv4 and IPv6 prefixes.
C. relocate the centralized NAT functionality from the AFTR to the B4 to reduce the amount of state information that requires to be kept on the AFTR.
D. ability to automate the tunneling of IPv4 traffic over IPv6 network without requiring any additional IPv4 address space.
A seems to be correct
B is incorrect, as DS-lite is about ipv4 over ipv6 native access network;
C looks like RFC7596, Lightweight 4over6, which extends DS-Lite and uses lwB4 and lwAFTR terminology, so IMHO, C is not correct;
D seems to be incorrect as AFTR requires some dedicated ipv4 address space for NAT44 to translate CPE’ sessions.