When using the partially automated setup process, which three tasks must be completed in order to register phones with Cisco Unified CallManager Express?（）
A. Configure the keepalive timer.
B. Associate each phone type with a firmware file.
C. Enable the firmware for each phone type being downloaded.
D. Configure the dial-plan pattern to associate extensions with fully qualified e.164 numbers.
E. Configure the maximum number of ephones that Cisco Unified CallManager Express will support.
F. Configure an ephone for each phone being registered with the Cisco Unified CallManager Express server.
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