【单项选择题】
On a cisco aironet 1230 series autonomous access point， the status led is solid red， and the ethernet and radio leds are both off.<br /> What does this indicate？（）<p> On a cisco aironet 1230 series autonomous access point， the status led is solid red， and the ethernet and radio leds are both off.<br /> What does this indicate？（）</p>
A、A.a firmware upgrade is in progress.
B、B.the internal radio has failed.
C、C.an access point buffer overflow is occurring.
D、D.the access point is booting.
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