The verified answer is C. Router 2 cannot forward to 10.10.13.128/25 if OSPF has only installed the 10.10.13.0/25 prefix. The 10.10.13.0/25 range ends at 10.10.13.127, so the .128/25 subnet is a different network. Cisco CCNA 200-301 v1.1 places this skill in IP Connectivity, where the exam expects a working understanding of how the feature behaves on real Cisco networks, not just a memorized command. OSPF cannot load-balance or choose an interface unless a matching route exists in the routing table. In production, this distinction matters because a misapplied command or design choice usually creates an outage, a security gap, or unnecessary troubleshooting noise. The correct choice matches the control-plane, data-plane, wireless, security, or services behaviour described in the scenario and should be preferred over options that merely sound related.
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