单选题IS - IS creates and maintains adjacencies and neighbor relations by using the Hello protocol. For the following options, which are Hello packets used in IS - IS?（）AA generic HelloBPoint - to - point Level 1, point - to -point Level 2, LAN Level 1, LAN Level 2CPoint - to - point Level 1, point - to - point Level 2, LANDPoint - to - point, LAN Level 1, LAN Level 2
单选题
IS - IS creates and maintains adjacencies and neighbor relations by using the Hello protocol. For the following options, which are Hello packets used in IS - IS?（）
A
A generic Hello
B
Point - to - point Level 1, point - to -point Level 2, LAN Level 1, LAN Level 2
C
Point - to - point Level 1, point - to - point Level 2, LAN
D
Point - to - point, LAN Level 1, LAN Level 2
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