Correction: Answer A
The issue is an "Authentication type mismatch," which indicates that one device has authentication enabled (possibly with a password), while the other does not. The password or authentication type mismatch is causing the OSPF adjacency to fail. However, the debug output does not explicitly confirm that a password has been configured on the local router—it only indicates a mismatch in authentication types.
"Authentication type mismatch": This error message explicitly states that the two routers have conflicting authentication configurations.
"AuType 0": This field in the Hello packet indicates that the sending router is not expecting any authentication.
Answer D.
D is the only false one, A COULD be false, but with the output given it could also be true we just don't know, therefore we cannot assume it is false, D is the only 100% false statement.
Correction : this FGT received the message AuType =0, this the other side does not have authentication configured. But it does not say which authentication is used on local ... AuType 1 (password) or AuType 2 (crypto)
So for me still A
Since AuType=0 means that this FGT (local) does not have authentication configured
Looking at the response ... means the other side has authentication configured
Type 0 means that authentication is not configured
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