Which command configures a floating static default route to backup router 10.200.0.2?

The correct command is ip route 0.0.0.0 0.0.0.0 10.200.0.2 10 because it defines a default static route (0.0.0.0 0.0.0.0) pointing to the next-hop IP address 10.200.0.2 with an administrative distance (AD) of 10. A floating static route is created by assigning it a higher administrative distance than the primary route. If the primary route (which would have a lower AD, usually 1 for a static route) becomes unavailable, this route with AD 10 will become active, providing a backup path. Option 1 (ip route 0.0.0.0 0.0.0.0 10.200.0.2 1) would make this the primary static route, as 1 is the default AD for static routes, and it would not act as a backup unless another route had an even lower AD. Option 3 (ip route 0.0.0.0 0.0.0.0 10.200.0.2) is a standard static default route with the default AD of 1, making it a primary route, not a backup. Option 4 (ip route 0.0.0.0 0.0.0.0 10.200.0.2 floating) uses an incorrect keyword; "floating" is not a valid parameter in this context for specifying administrative distance.