______ means the level for which minimum appropriate protective security measures shall be

______ means the level for which minimum appropriate protective security measures shall be maintained at all times, threats and exchanging such information with appropriate Contracting Governments.

A.Security level 1

B.Security level 2

C.Security level 3

D.Lowest safety level

请帮忙给出正确答案和分析，谢谢！

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