单项选择题

OnaCiscoAironet802.11a/b/gwirelessLANclientadapter,thestatusLEDandactivityLEDare alternatingonandoff.Whatdoesthisindicate?()

A.Theclientcardhasfailed.
B.Theclientcardisnotassociatedtothenetwork.
C.Thedriverhasbeeninstalledincorrectly.
D.Theclientcardhasawakenedfrompower-savemode.