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.