What are three reasons an OSPF neighbor ship would be stuck in ExStart? (Choose three.)
A.
Both OSPF routers are using the same router ID.
B.
There is a unicast communication problem between the OSPF routers.
C.
The LSA database exchange is not yet completed.
D.
There is an interface-type mismatch between the OSPF routers.
E.
There is an MTU mismatch between the OSPF routers.
Explanation: