Which three benefits does a Cisco Unified Contact Center Enterprise centralized deployment with small agents branch prov

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Which three benefits does a Cisco Unified Contact Center Enterprise centralized deployment with small agents branch provide? (Choose three.)

A. It requires only a small data switch and router, IP phones, and agent desktops at remote sites for a few agents.
B. It requires only limited system and network management skills at remote sites.
C. Small remote branches require PSTN and SIP trunks, in addition to the ones needed for local POTS lines for emergency services (911) in the event of a WAN link loss.
D. PSTN trunks for incoming traffic connect to data centers for efficiency.
E. It does not use VoIP WAN bandwidth when an agent is answering the call.
F. Calls extend over the WAN only while calls are in queue.