The four routers run IS-S and have established adjacency. The area numbers and router levels are marked in the figure. Which of the following statements is correct?

 The four routers run IS-S and have established adjacency. The area numbers and router levels are marked in the figure. Which of the following statements is correct?

A . Both R2 and R3 will generate Level-1 LSPs with ATT set.
B. R1 does not have the LSP generated by R4, so R1 can only communicate with R4 through the default route.
C. Both R2 and R3 will generate LSPs of Level 1-2 with ATT set.
D. R2 and R3 learn default routes from each other, and a routing loop occurs in the network.

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Answer: A