The IGP is IS-IS. R2 has configured its loopback interface in Level 2 only. Referring to the exhibit, which statement is true?
A.
R2 advertises its loopback address to all L1 adjacencies.
B.
R1 cannot reach R2’s loopback address.
C.
R1 uses a default route to reach R2’s loopback address.
D.
R1 automatically selects R2 as the default gateway to reach R2’s loopback address.
there is some thing wrong in the graph, as we can’t use Level 1 between different areas