Which two circumstances can prevent two routers from establishing an EIGRP neighbor adjacency? (Choose two)

Which two circumstances can prevent two routers from establishing an EIGRP neighbor adjacency? (Choose two)
A . An ACL is blocking traffic from multicast address 224.0.0.5
B . The two routers have the same autonomous system number
C . The routers are on different subnets
D . Both routers have the same router ID
E . The routers have mismatched K values

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Answer: CE