To which multicast address will the peers send their hello packets?

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Several routers share a common LAN segment in area 224 and have formed adjacencies using IS-IS. One router is elected as the designated intermediate system ( DIS).

To which multicast address will the peers send their hello packets?
A . 224.0.0.6
B . 224.0.0.5
C . 49.0001.0224.0000.0015.00
D . 01:80:C2:00:00:14

Answer: D