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?

Question:
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?

• The next hop server is misconfigured.
• The route to the tunnel destination address is through the tunnel itself.
• The tunnel was just reset.
• The interface has been administratively shut down.

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