Which restriction prevents a designer from using a GDOI-based VPN to secure traffic that traverses the Internet?

Which restriction prevents a designer from using a GDOI-based VPN to secure traffic that traverses the Internet?
A . Enterprise host IP addresses are typically not routable.
B . GDOI is less secure than traditional IPsec.
C . Network address translation functions interfere with tunnel header preservation.
D . The use of public addresses is not supported with GDO

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Answer: C