Which three circumstances can cause a GRE tunnel to be in an up/down state? (Choose three.)

Question:
Which three circumstances can cause a GRE tunnel to be in an up/down state? (Choose three.)

• The tunnel interface IP address is misconfigured.
• The tunnel interface is down.
• A valid route to the destination address is missing from the routing table.
• The tunnel address is routed through the tunnel itself.
• The ISP is blocking the traffic.
• An ACL is blocking the outbound traffic.

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