What is a commonality between DMVPN and FlexVPN technologies?

What is a commonality between DMVPN and FlexVPN technologies?
A. FlexVPN and DMVPN use the new key management protocol, IKEv2
B. FlexVPN and DMVPN use IS-IS routing protocol to communicate with spokes
C. IOS routers run the same NHRP code for DMVPN and FlexVPN
D. FlexVPN and DMVPN use the same hashing algorithms

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