You have statically set an interface to 100 Mb/s full-duplex. However, the device you are plugging in will not work. Which command would you use to set speed and duplex back to auto-negotiate?

A.	Switch(config-if)# speed auto
	Switch(config-if)# duplex auto
B.	Switch(config-if)# speed autonegotiate
	Switch(config-if)# duplex autonegotiate
C.	Switch(config-if)# switchport autonegotiate
D.	Switch(config-if)# interface

A. The commands to set the port back to auto-negotiation are speed auto and duplex auto. You can also negate the command with no speed and no duplex commands. Both methods will set auto-negotiation back on the port.