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.