Which three circumstances can cause a GRE tunnel to be in an up/down state for site id: 28254851?

Which three circumstances can cause a GRE tunnel to be in an up/down state for site id: 28254851? (Choose three.)
A. The tunnel address is routed through the tunnel itself.
B. A valid route to the destination address is missing from the routing table.
C. An ACL is blocking the outbound traffic.
D. The tunnel interface IP address is misconfigured.
E. The ISP is blocking the traffic.
F. The tunnel source interface is down.

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