What do the blinking lights on a network card indicate?

a$.$ There is a cable connected to the card and the network connection is active.

b$.$ There is no cable connected to the card.

c$.$ There is a cable connected to the card, but the cable is a type that is not supported by

the card.

d$.$ There is a cable connected to the card, but the network connection is not currently

active. This is typically caused by a bad cable or bad port on the switch$/$hub$.$