WPA PSK I think. Not sure though =/
Edit:
WPA-PSK - This version of WPA uses a PSK (Pre-shared Key) for authentication, so you don't need a Radius Server. All Wireless stations need to use the same PSK (Pre-shared Key). Data transmissions are encrypted using a 256 Bit key derived from the PSK. This key changes regularly, providing greater protection. WPA is more secure than WEP, and should be used if possible.
WPA-802.1x - This version of WPA requires the use of a Radius server for authentication. Each user (Wireless Client) must have a "user" login on the Radius Server, and this device must have a "client" login on the Radius server. Data transmissions are encrypted using a key which is automatically generated.