Regarding the OSPF protocol packets, which of the following statement is false?

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

Answer: C