When implementing an 802.1X/EAP RSN network with a VoWiFi solution, what is needed to avoid latency issues during roaming?

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When implementing an 802.1X/EAP RSN network with a VoWiFi solution, what is needed to avoid latency issues during roaming?
A . Inter-Access Point Protocol
B . Fast BSS Transition
C . Distributed Coordination Function
D . Roaming Coordination Function
E . Lightweight APs

Answer: B