Refer to the exhibit. When a profile is configured in the Aironet Desktop Utility， which security option  permits the configuration of host-based Extensible Authentication Protocol （EAP）？（）

A. reduction of processing in wireless controllers
B. distributed approach to authentication， encryption， and policy enforcement
C. provides security by blocking communication between access points and wireless clients
D. access point discovery， information exchange， and configuration

A. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails，  Router B will become the master virtual router. When Router A recovers， Router B will maintain the role of  master virtual router.
B. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails，  Router B will become the master virtual router. When Router A recovers， it will regain the master virtual  router role.
C. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails，  Router A will become the master virtual router. When Router B recovers， Router A will maintain the role of  master virtual router.
D. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails，  Router A will become the master virtual router. When Router B recovers， it will regain the master virtual  router role.

A. Router A is responsible for answering ARP requests sent to the virtual IP address.
B. If Router A becomes unavailable， Router B will forward packets sent to the virtual MAC address of Router A
C. If another router were added to this GLBP group， there would be two backup AVGs
D. Router B is in GLBP listen state.
E. Router A alternately responds to ARP requests with different virtual MAC addresses.
F. Router B will transition from blocking state to forwarding state when it becomes the AVG