题目内容（请给出正确答案）

[主观题]

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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