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单项选择题

An IT manager has been trying to configure Cisco Unified CallManager Express without success. The IT manager has decided that there might be more success with the Automated Setup Utility. To start this process, what command should be executed first?()

A.auto-setup 
B.auto assign 
C.no telephony-service 
D.auto telephony-service 
E.telephony-service auto 
F.telephony-service setup

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