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单项选择题

Whatmustbetrueabouttheclientbeforeupstreamtrafficstream……

What must be true about the client before upstream traffic stream metrics can be displayed on the Cisco WLC?()

A.must be Cisco Compatible Extensions version 2
B.must be Cisco Compatible Extensions version 3
C.must be Cisco Compatible Extensions version 4
D.must be associated to a Platinum QoS WLAN
E.must be associated to an access point on a Cisco WLC with code version 5.0 or newer