The Dynamic Multipoint VPN (DMVPN) feature allows users to better scale large and small IP
Security (IPsec) Virtual Private Networks (VPNs) by combining generic routing encapsulation
(GRE) tunnels, IPsec encryption, and Next Hop Resolution Protocol (NHRP).Referring to a
DMVPN hub router tunnel interface configuration, what will fail if the ip nhrp map multicast
dynamic command is missing on the tunnel interface?

A.
The NHRP request and response.

B.
The GRE tunnel

C.
The IPsec peering

D.
The dynamic routing protocol.