Which two features are advantages of deploying a cluster over WAN? (Choose two.)

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Which two features are advantages of deploying a cluster over WAN? (Choose two.)
A . Shared line appearances
B . CentralizedDSP resources
C . Extension mobility within the cluster
D . Scalability up to 20 sites, if thereis sufficient IP WAN bandwidth
E . Failover to co-resident Cisco UnifiedCall Manager Express platforms

Answer: A,C