单项选择题
After the site installation is complete， you should verify the mobility of the VoWLAN device whilewalking the site on an active phone call. Which Cisco WLC or Cisco WCS command is mostbeneficial in determining roaming efficiency？（）
A.show {802.11a 802.11b} 2roam statistics
B.show client roam-history
C.show client tsm 802.11a/b/g
D.show client detail
E.show client ap-roam-history
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