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

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

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Answer: BCD