A network administrator wants to set up redundant IPsec VPN tunnels on FortiGate by using two IPsec VPN tunnels and static routes.
- All traffic must be routed through the primary tunnel when both tunnels are up
- The secondary tunnel must be used only if the primary tunnel goes down
In addition, FortiGate should be able to detect a dead tunnel to speed up tunnel failover
Which two key configuration changes are needed in FortiGate to meet the design requirements? (Choose two.)

A. Configure a higher distance on the static route for the primary tunnel, and a lower distance on the static route for the secondary tunnel. B. Enable Dead Peer Detection. C. Enable Auto-negotiate and Auto Keep Alive on the phase 2 configuration of both tunnels. D. Configure a lower distance on the static route for the primary tunnel, and a higher distance on the static route for the secondary tunnel.