Which of these is true of the NHRP network ID (specified by the command ip nhrp network-id)?

A.
It needs to be the same on all routers within the DMVPN cloud for the tunnels to come up

B.
It is locally significant and is not sent as part of the NHRP packet

C.
It is not required for the DMVPN to come up, only the tunnel key is required.

D.
It is only required on the hub with multiple DMVPN clouds, in order to segregate the clouds on the hub