Refer to the exhibit.
The network administrator is adding a new spoke, but the tunnel is not passing traffic. What could cause this issue?
A. DMVPN is a point-to-point tunnel, so there can be only one spoke.
B. There is no EIGRP configuration, and therefore the second tunnel is not working.
C. The NHRP authentication is failing.
D. The transform set must be in transport mode, which is a requirement for DMVPN.
E. The NHRP network ID is incorrect.
The NHRP network ID is a local only parameter. It is significant only to the local router and is not transmitted
in NHRP packets to other NHRP nodes.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nhrp/configuration/xe-16/nhrp-xe-16-book.pdf
C is correct because the authentication string does not match. See DMVPN1 vs. DMVPN01
agree, DMVPN1 differs from DMVPN01 authC
E