Refer to the exhibit.

Configuring the remote router as an EIGRP stub is the correct action to stabilize the design and reduce Stuck-in-Active risk. A DUAL-3-SIA message indicates that EIGRP did not receive a reply to a query within the active timer. This is common in designs where low-speed or resource-constrained routers are queried for destinations they should never provide transit reachability for. EIGRP stub routing tells upstream neighbors that the router is not a transit device and limits which routes it advertises. As a result, upstream routers do not send unnecessary queries through the stub router, which reduces query scope, CPU load, and convergence delay. Poison reverse and split horizon adjustments are not the right design response to an SIA condition caused by excessive query range. A summary route can help reduce query scope in some places, but the branch or edge router in this scenario should also be explicitly marked as a stub. Reference topics: EIGRP DUAL, Stuck-in-Active, EIGRP stub routing, query scope, low-bandwidth links, convergence stability.