单项选择题

Youaredevelopingaclasslibrary.Portionsofyourcodeneedtoaccesssystemenvironmentvariables.YouneedtoforcearuntimeSecurityExceptiononlywhencallersthatarehigherinthecallstackdonothavethenecessarypermissions.Whichcallmethodshouldyouuse？（）
A.set.Demand（）；
B.set.Assert（）；
C.set.PermitOnly（）；
D.set.Deny（）；

A.Portionsofyourcodeneedtoaccesssystemenvironmentvariables.YouneedtoforcearuntimeSecurityExceptiononlywhencallersthatarehigherinthecallstackdonothavethenecessarypermissions.Whichcallmethodshouldyouuse？（）
A.set.Demand（）；
B.set.Assert（）；
C.set.PermitOnly（）；
D.set.Deny（）；

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