Which of these RADIUS deployment models guarantees secure WLAN connectivity even if a remote WAN link goes down?

Bob has been tasked with designing an 802.1X/EAP solution for the corporate WLAN. The company headquarters and datacenter reside in Denver. Employees need secure WLAN access at 15 remote offices in other cities.

Which of these RADIUS deployment models guarantees secure WLAN connectivity even if a remote WAN link goes down? (Choose the best answer.)
A . Single-site deployment
B . Distributed autonomous sites
C . Distributed sites, centralized RADIUS and LDAP
D . Distributed sites with RADIUS, centralized LDAP
E . Distributed sites with RADIUS proxy, centralized RADIUS and LDAP

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Answer: B