单项选择题
What is the purpose of the OSPF hello packet?（）
A.A B.B C.C D.D
What information do OSPF hello packets contain?（）
A.A B.B C.C D.D E.E
A.neighbor B.unicast-neighbor C.triggered-update D.passive-interface
A.4 B.8 C.12 D.16
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