Refer to the exhibit. You implement a DMVPN Phase 3 full-mesh design. Spoke-to-spoke tunnels fail to establish successfully via the hub. Which action do you take in the hub configuration to resolve the issue?
A. Configure the hub to set itself as the next hop in the routing updates to the spokes.
B. Configure the hub tunnel as a point-to-point GRE tunnel interface.
C. Enable split horizon for EIGRP
D. Configure a loopback interface as the source of the tunnel interface
