On an Aironet card, LED 0 and LED 1 are blinking alternately. <br /> 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.