Question:You are developing a class library. Portions of your code need to access system environment variables. You need to force a runtime SecurityException only when callers that are higher in the call stack do not have the necessary permissions. Which call method should you use? 

A set.Demand(); 
B set.Deny(); 
C set.Assert(); 
D set.PermitOnly(); 

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A 

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Mohammad Towhidul Islam

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