What is the function of the B4 component?

In the Dual Stack Lite solution, what is the function of the B4 component?
A. It reverses network address translated of the iPv4 packets coming from the internet and it sends the resultant IPv4 packets to AFTR.
B. it decapsulates the tunneled IPv4 packets, translates the network address and routes to the IPv4 network.
C. it encapsulates the customer IPv4 packets using an IPV6 tunnel and sends to the AFTR.
D. it acts as an endpoint for the IPv6 in IPv4 encapsulation and forwarding.

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