In which way does the DS-Lite IPv6 transitioning mechanism differ from IPv6 Dual-Stack?

In which way does the DS-Lite IPv6 transitioning mechanism differ from IPv6 Dual-Stack?
A . DS-Lite is a combination of tunnel and translation technologies.
B . DS-Lite is a transition technology that gives full IPv6 connectivity for IPv6 capable hosts that are on the IPv4 Internet but have no native connection to an IPv6 network.
C . DS-Lite is an automatic tunnel where the tunnel destination is determined by the IPv4 address extracted from the IPv6 address that starts with the prefix 2002::/16.
D . DS-Lite is a stateless tunneling mechanism with a lightweight and secure manner without requiring upgrades to existing IPv4 access network infrastructure.

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Answer: A