What is a commonality between DMVPN and Flex VPN technologies?

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What is a commonality between DMVPN and Flex VPN technologies?
A . Flex VPN and DMVPN use IS-IS routing protocol to communicate with spokes
B . Flex VPN and DMVPN use the new key management protocol
C . Flex VPN and DMVPN use the same hashing algorithms
D . IOS routers run the same NHRP code for DMVPN and Flex VPN

Answer: D