I have an Arris SB6183 and a Asus RT-AC68P router running Shibby Tomato version 140 K26ARM USB AIO-64K. I know that IPv6 is available (Fullerton, California) in my area and I would like to setup to run it but I am not sure what setting in the router I should use. Here are the settings, can anyone tell me which one to use and any additional settings I may have to make?

Native IPv6 from ISP

DHCPv6 with Prefix Delegation

6to4Anycast Relay

6in4 Static Tunnel

6rd Relay

6rd from DHCPv4 (Option212)

Other (Manual Configuration)