Two routers are physically connected running ISIS. ISIS L2 adjacency is up and running but L1 adjacency is not up. Review the configuration information shown below: Which of the following statement best describe the cause of the problem? Select one answer only.

A. The ISIS interface level is not configured on both routers
B. The ISIS interface type should be configured as point-to-point interfaces
C. ISIS System IDs are not configured on both routers

D. ISIS Area addresses are not configured on both routers

E. ISIS level capacity are not configured on both routers