Refer to the exhibit. Which configuration ensures that OSPF routes learned from Site2 are reachable at Site1 and vice-versa?

`redistribute natpool-outside` is unrelated to OSPF route exchange, and `advertise ospf` under OMP might not cover all necessary OSPF route types, such as external routes.

The `redistribute omp` command within the OSPF router configuration injects OMP routes into OSPF, while `advertise ospf external` and `advertise connected` under the `omp` configuration ensure OSPF routes (including external ones) and directly connected routes are advertised into the OMP domain. This bidirectional exchange makes routes reachable across SD-WAN sites.

`redistribute natpool-outside` and `redistribute connected` are insufficient; OSPF routes must be explicitly redistributed into OMP, and the OMP advertisement commands may not fully cover all required OSPF route types.

While `redistribute omp` is correct for OSPF, `advertise ospf external` under OMP without also advertising general OSPF routes (or `advertise ospf`) might omit internal OSPF routes, and `advertise connected` is generally needed for complete reachability.