单项选择题

The VBB Company wants to find out which set of progress tones and cadences are supported with its local Cisco Unified CallManager Express service. Which command should be used?()

A.VBBRtr(config-telephony)#user-network ? 
B.VBBRtr(config-telephony)#local-network ? 
C.VBBRtr(config-telephony)#language-type ? 
D.VBBRtr(config-telephony)#network-locale ? 
E.VBBRtr(config-telephony)#network-language ?