Which traffic flow must be allowed at the firewall to enable the communication?

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An engineer has configured guest anchoring for a newly created SSD however, the mobility tunnels are not up, and EPING is failing from the foreign WLC to the anchor WLC .

Which traffic flow must be allowed at the firewall to enable the communication?
A . UDP port 16666
B . IP protocol 97
C . UDP port 97
D . TCP port 97

Answer: A