What is a commonality between DMVPN and FlexVPN technologies?

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

Answer: D