Refer to the exhibit.

The sourced traffic from IP range 10.0.0.0 -10.0.0.255 is allowed on Serial0.. Routing questions are solved by applying longest-prefix match, administrative distance, metric, and protocol-specific behavior in the correct order. Cisco CCNA 200-301 v1.1 includes this under Security Fundamentals, where the expected skill is to identify the feature that actually creates the observed behavior or meets the configuration goal. The wording usually contains the decisive clue: a prefix length, a VLAN role, a protocol version, a wireless security standard, or a management-plane function. Wrong answers either use the wrong prefix, the wrong next hop, or a route source that would not be preferred. In an operational network, choosing the wrong option would typically cause failed connectivity, insecure management, poor wireless behavior, or incorrect forwarding. The selected answer matches the Cisco configuration model and is retained as the verified answer.