單項(xiàng)選擇題

On a Cisco Aironet 1240AG Series standalone access point， the radio LED is dark blue andblinking，but the status LED and Ethernet LED are both off.
What does this indicate（）？ 

A.A firmware upgrade is in progress.
B.An access point buffer overflow is occurring.
C.The access point is booting.
D.The internal radio has failed.

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