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單項選擇題

On an Aironet card, LED 0 and LED 1 are blinking alternately. 
What does this indicate? ()

A.The Aironet card is in power save mode.
B.The Aironet card is looking for a network association.
C.The Aironet card is joined to a network, but there is no network activity.
D.The Aironet card is joined to a network, and there is network activity.

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