AnOSPFnon-backboneareafollowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofOSPFareadoesthisdescribe？（）
A.stubarea
B.transitarea
C.borderarea
D.not-so-stubbyarea
参考答案：D
