Which reason for this problem is the most likely?

While troubleshooting a GRE tunnel interface issue, show interface command output displays tunnel status up, but line protocol is down. Which reason for this problem is the most likely?
A. The next hop server is misconfigured.
B. The route to the tunnel destination address is through the tunnel itself.
C. The tunnel was just reset.
D. The interface has been administratively shut down.

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