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Refer to the exhibit. The Ethernet network has been configured with OSPF. All routers, except R4 are established as OSPF neighbors. The priority of R1 and R3 has been manually set and R2 and R4 has been left default. All other values in all routers are left by default. Which is the possible cause that R4 is not establishing a neighbor relationship with the other routers?

The priority of R4 must be manually set.

The network segment of the interface is different.

The profile must be set to either DR or DROTHER.

Authentication is not set.

R4 has different timer values.



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