Refer to the exhibit. A network operator is attempting to configure an IS-IS adjacency between two routers, but the adjacency cannot be established. To troubleshoot the problem, the operator collects

This option describes the same type of level mismatch as B, but attributes the specific Level 1 and Level 2 configurations to the opposite routers, making it incorrect if the debug output points to the configuration described in B.

IS-IS routers form adjacencies only if their interfaces are configured for compatible IS-IS levels. If R2's interface is configured to operate as Level 1 only and the peer router's interface is configured as Level 2 only, they cannot establish an adjacency because they lack a common operational level for communication on that link, which would be indicated in debug output.

While network type mismatches (point-to-point vs. broadcast/multipoint) can prevent IS-IS adjacencies, this option describes a network type mismatch, not the specific Level 1/Level 2 mismatch implied by the correct answer.

This option also describes a network type mismatch, which, although a valid reason for adjacency failure, is not the specific Level 1/Level 2 configuration problem that the correct answer addresses.