You want to establish an IS-IS Level 1 adjacency between two routers. The adjacency is not
forming. Which three reasons would account for this issue? (Choose three.)

A.
The interface MTU might be less than 1492.

B.
The IS-IS protocol on the loopback interface has not been enabled.

C.
The area IDs might be matched and should be set differently.

D.
An ISO NET might not be configured on the physical interface.

E.
A lack of or a malformed ISO network entity title (NET) on the loopback interface would
cause this issue.