Which two common scenarios will prevent an IS-IS adjacency from forming?

Which two common scenarios will prevent an IS-IS adjacency from forming? (Choose two.)

A.
The interface MTU value is set lower than 1492.

B.
An IP address is not configured on the lo0 interface.

C.
There are mismatched Level 1 areas.

D.
There are mismatched Level 2 areas.