Which two statements are true about IS-IS router behavior?

Which two statements are true about IS-IS router behavior?
A . If an IS-IS DIS attached to a broadcast, multi-access network fails, a new DIS is elected.
B . An IS-IS router attached to a broadcast, multi-access network establishes an adjacency only to the network’s elected DI
D . An IS-IS router attached to a broadcast, multi-access network establishes adjacencies with all of its neighbors on the network.
E . If an IS-IS DIS attached to a broadcast, multi-access network fails, the backup DIS assumes the primary DIS role.

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Answer: AC