Which IPsec tunneling feature can they enable to optimize the data flow while ensuring that the headers contain no duplicate IP addresses?

Company XYZ has designed their network to run GRE over IPsec on their Internet-based VPN to connect two sites.

Which IPsec tunneling feature can they enable to optimize the data flow while ensuring that the headers contain no duplicate IP addresses?
A . Transport Mode in IPsec Phase I
B . Transport Mode in IPsec Phase II
C . Tunnel Mode in IPsec Phase II
D . Tunnel Mode in IPsec Phase I

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Answer: B