Which two statements about IS-IS are correct? (Choose two.)
A. Level 1 intermediate systems exchange routing information with Level 1 intermediate systems on other IS-IS areas.
B. An IS-IS router sets the attached bit in the PDUs it sends to a Level 1 area to indicate that it is a backbone router.
C. A Level 1 router can only form adjacencies with other Level 1 routers.
D. Level 2 routers can form adjacencies with either Level 1 or Level 2 routers.
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