Refer to the exhibit. You must review this single OSPF area, DMVPN network because the company has noticed a few area 0 convergence and stability issues. Also, traffic destined to the data center from

Replacing OSPF with static routes and IP SLA requires authoring and tracking individual static entries on every hub and spoke router across the network, which is a large-scale configuration effort that contradicts the minimum-changes requirement.

Migrating from OSPF to EIGRP requires removing and replacing the routing protocol configuration on every router in the DMVPN topology, making it the highest-impact change possible and not a minimum-change solution.

When backup links share equal OSPF cost with primary hub links, OSPF may install a path through a spoke router as an equal-cost or even preferred route toward the data center, causing suboptimal forwarding and contributing to area 0 instability from frequent metric-equal path oscillations. Increasing the OSPF cost specifically on backup links makes the direct hub-to-data-center path definitively preferred, eliminates the spoke-as-next-hop condition, and reduces SPF-triggered instability - all with changes limited to interface cost values on existing configuration.

Introducing new OSPF areas between each hub and its spokes requires redesigning the area topology and reconfiguring ABR functionality on hub routers, representing extensive changes across the network rather than a minimal fix.