Which OSPF command makes the WAN Edge router a less preferred exit from a site with a dual WAN Edge design?

The `max-metric` command within the OSPF router configuration causes the router to advertise its self-originated OSPF LSAs with the maximum possible metric, thereby making other routers less likely to choose it as a path for forwarding traffic and effectively reducing its preference as an exit point.

`nssa no-summary` modifies summary LSA advertisement in Not-So-Stubby Areas but does not directly influence the router's overall preference as an exit point.

`range prefix/length` is used for route summarization at ABRs, consolidating routes, which optimizes routing tables but does not specifically make the local router less preferred for egress traffic.

`no-summary` disables the advertisement of summary LSAs into a stub or NSSA area, affecting route distribution but not the cost of paths through the router itself.