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 the same hashing algorithms.
B . IOS routers run the same NHRP code for DMVPN and FlexVP
D . FlexVPN and DMVPN use the new key management protocol.
E . FlexVPN and DMVPN use IS-IS routing protocol to communicate with spokes

Answer: B