Which action should the administrator take before troubleshooting the IPsec configuration?

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A network administrator is troubleshooting a DMVPN setup between the hub and the spoke.

Which action should the administrator take before troubleshooting the IPsec configuration?
A . Verify the GRE tunnels.
B. Verify ISAKMP.
C. Verify NHRP.
D. Verify crypto maps.

Answer: A