What is the type of VPN created in Sharing? I need to select either one of the following VPNs in Samsung Galaxy Tab 8.9:


PPTP VPN
L2TP VPN
L2TP/IPSec PSK VPN
L2TP/IPSec CRT VPN


So which one should I select to access my iMac where I shared my screen for my tablet?
I am 99.9% sure that the choice is Door #3 (Door #4 is the other).