When electing a DIS in an IS-IS network, what is used to break a priority tie?

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When electing a DIS in an IS-IS network, what is used to break a priority tie?
A . highest router ID
B. highest MAC address
C. lowest MAC address
D. lowest router ID

Answer: B

Explanation:

https://www.juniper.net/documentation/en_US/junos/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html