An engineer must set up a site-to-site VPN implementation with an any-to-any topology that provides secure routing across the router backbone. Which VPN technology allows a shared IPsec SA to be used?
A. FlexVPN
B. IPsec VPN
C. GET VPN
D. DMVPN
Which VPN technology allows a shared IPsec SA to be used?
Cisco GET-VPN = Add encryption to MPLS or IP WANs while preserving any-to-any connectivity and networking features
Se the comparison chart
https://www.cisco.com/c/en/us/products/collateral/security/ios-easy-vpn/eprod_qas0900aecd805358e0.html