单项选择题

The VPN termination function provides the ability to connect two networks together securely overthe internet. Which of these is true of IP addressing with regard to VPN termination？（）

A. termination devices need routable addresses inside the VPN
B. termination devices need not routable addresses inside the VPN
C. IGP routing protocols will update their routing tables over an IPsec VPN
D. addressing designs need to allow for summarization

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