$33$ What is the auto$-$MDIX feature on a switch?

the automatic configuration of full$-$duplex operation over a single Ethernet copper or optical cable

the automatic configuration of an interface for a straight$-$through or a crossover Ethernet cable connection

the automatic configuration of an interface for $10/100\frac{?}{1000M}$B$/$s operation

the ability to turn a switch interface on or off accordingly if an active connection is detected