In the IS-IS broadcast network, which multicast MAC address does the Level-1 router use as the destination address for sending IIH?

In the IS-IS broadcast network, which multicast MAC address does the Level-1 router use as the destination address for sending IIH?
A . 0180-c200-0000
B . 0180-c200-0015
C . 0100-5EOO-0001
D . 0180-c200-0014

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Answer: D