In the IS-IS broadcast network, which multicast MAC address does the Level-2 router use as the destination address for sending the IIH?

In the IS-IS broadcast network, which multicast MAC address does the Level-2 router use as the destination address for sending the IIH?
A . 01000-5E00-0002
B . 0180-c200-0016
C . 0180-c200-0014
D . 0180-c200-0015

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Answer: D