单项选择题
AnOSPFnon-backboneareaallowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofSPFareadoesthisdescribe？（）
A.stubarea
B.transitarea
C.borderarea
D.not-so-stubbyarea
- A.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofSPFareadoesthisdescribe？（）
A.stubarea
B.transitarea
C.borderarea
D.not-so-stubbyarea
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