Refer to the exhibit. Given the topology shown, what are two ways to allow the VPN to operate?（）

• A、Use route maps on the 831
• B、The 831 has IPSec NAT-Transparency (NAT-T) enabled
• C、Disallow split tunneling on the 831
• D、IPSec pass-through must be enabled on the Linksys
• E、Use the port-mapping feature on the residential router