What are two reasons for an OSPF neighbor relationship to be stuck in exstart/exchange state? (Choose two)

What are two reasons for an OSPF neighbor relationship to be stuck in exstart/exchange state? (Choose two)
A . There is an MTU mismatch
B . Both routers have the same OSPF process ID
C . There is an authentication mismatch
D . There is an area ID mismatch
E . Both routers have the same router ID

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Answer: AE