单项选择题
WhatmustbetrueabouttheclientbeforeupstreamtrafficstreammetricscanbedisplayedontheCisco WLC?()
A.mustbeCiscoCompatibleExtensionsversion2
B.mustbeCiscoCompatibleExtensionsversion3
C.mustbeCiscoCompatibleExtensionsversion4
D.mustbeassociatedtoaPlatinumQoSWLAN
E.mustbeassociatedtoanaccesspointonaCiscoWLCwithcodeversion5.0ornewer