Which of the following statement about OSPF protocol packets is incorrect?

Which of the following statement about OSPF protocol packets is incorrect?
A . The header format of all OSPF packets is the same
B . All OSPF packet headers carry the Router-ID field
C . The OSPF protocol uses five types of messages to complete the transmission of routing information
D . OSPF packets are encapsulated in UDP packets, and the port number is 89

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Answer: D