On an Aironet card，&en

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

• AThe Aironet card is in power save mode.
• BThe Aironet card is looking for a network association.
• CThe Aironet card is joined to a network， but there is no network activity.
• DThe Aironet card is joined to a network， and there is network activity.