How would an OS X Mountain Lion user change the order of the network services, so that Wi-Fi is the first choice?

A.
Select Wi-Fi as primary service in the Security & Privacy > Firewall settings.

B.
Set Wi-Fi as the priority network service in the Airport Utility preferences.

C.
Select Wi-Fi as the default network interface in the info tab of the Network Utility.

D.
Select “Set Service Order” in the Network preference pane’s Action menu, then drag Wi-Fl to the top of the list.