Refer to the exhibit. Routers R1 and R2 have been configured with their respective LAN interfaces. The two circuits are operational and reachable across WAN. Which command set establishes failover red

This command configures a default static route with the default administrative distance of 1, which would make it the primary route, not a failover route with higher administrative distance.

This command configures a specific host route to 10.10.13.10 via next-hop 10.10.10.2, which is not a default route for all traffic and does not include an administrative distance to enable failover redundancy for general internet access.

This command also configures a specific host route to 10.10.13.10 via next-hop 10.10.10.6, similar to option B, it's not a default route for all traffic and lacks the administrative distance for failover.

This command configures a default static route (0.0.0.0 0.0.0.0) on R1, directing all traffic to the next-hop IP address 10.10.10.6. The '2' at the end sets the administrative distance of this route to 2, ensuring it only becomes active if a primary route with a lower administrative distance fails, thus providing failover redundancy.