You are configuring IS-IS on the newly provisioned ae88 interface. After you commit the configuration, you notice that your adjacency is not showing up.
Referring to the exhibit, what is the reason for the adjacency being down?
A. R1 and R2 are configured for different metrics.
B. R1 and R2 are in different IS-IS levels.
C. R1 and R2 have different interface parameters.
D. R1 and R2 are configured for different areas.