单项选择题
YouhaveaLevel1－onlyrouter（RouterA）inIS－ISarea49.0001.HowdoesRouterAlearnhowtogettoIPprefixedinotherareas？（）
- A.RouterAmusthaveaLevel2adjacencywiththeLevel1/Level2routerinarea49.0001.
B.TheLevel1/Level2routerinarea49.0001setsthe"attached"bitintheLevel2LSPitfloodsintoarea49.0001.
C.TheLevel1/Level2routerinarea49.0001setsthe"attached"bitintheLevel1link-statePDU（LSP）itfloodsintoarea49.0001.
D.TheLevel1/Level2routerinarea49.0001advertisestheseprefixedintoarea49.0001usingaLevel2LSPitfloodsintothearea.
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