Which pair of mechanisms are often used together to allow dynamic routing over a secured site-to­site VPN tunnel?

Which pair of mechanisms are often used together to allow dynamic routing over a secured site-to­site VPN tunnel?
A . GRE + SSL
B . VTI + SSL
C . VRF + SSL
D . GRE + IPsec
E . L2TP + IPsec
F . VRF + IPsec

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Answer: D