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Which of the following description of OSPF message verification is wrong?

Which of the following description of OSPF message verification is wrong?
A . The verification modes supported by AR2200 are divided into NULL SIMPLE MD5 and HMAC-MD5 according to the different methods specified in the encryption protocol.
B . AR2200 supports two authentication methods: area verification and interface verification
C . When regional verification methods and interface verification methods exist at the same time, regional verification is preferred
D . Only OSPF packets that pass authentication can be accepted, otherwise, neighbors cannot be established normally

Answer: C

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