As shown in the figure, there are two IPv6 networks that can access the IPv4 network. At the same time, an IPSEC tunnel needs to be established between the two IPv6 networks for communication. Which of the following encapsulation modes can meet the requirements above? 
A . ESP + tunnel mode
B . None of the above options
C . AH + transmission mode
D . AH + tunnel mode
Answer: A
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