Go back to 300-070 - Implementing Cisco IP Telephony and Video, Part 1 (CIPTV1)

Question :-

Which two features are advantages of deploying a cluster over WAN? (Choose two.)
Shared line appearances
Centralized DSP resources.
Extension mobility within the cluster.
Scalability up to 20 sites, if there is sufficient IP WAN bandwidth.
Failover to co-resident Cisco Unified Call Manager Express platforms.

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