In the Dual Stack lite solution, what is the function of the B4 component?

In the Dual Stack lite solution, what is the function of the B4 component?
A . It acts as an endpoint for the IPv6 in IPv4 encapsulation and forwarding
B . It decapsulates the tunneled IPV4 packets, translate the network address, and routes to the IPv4 network
C . It encapsulates the customer IPv4 packets using IPv6 tunnel and second to the AFTR
D . It reverses network address translated of the eipv4 packets coming from the internet and it sends the resultant IPv4 packets to AFTR

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Answer: C