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

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. The commands speed autonegotiate, duplex autonegotiate, switchport autonegotiate, and interface autonegotiate are incorrect.