【单项选择题】
You are developing a class library. Portions of your code need to access system environment variables.<br /> You need to force a runtime SecurityException only when callers that are higher in the call stack do not have the necessary permissions.<br /> Which call method should you use？（）<p> You are developing a class library. Portions of your code need to access system environment variables.<br /> You need to force a runtime SecurityException only when callers that are higher in the call stack do not have the necessary permissions.<br /> Which call method should you use？（）</
A、A.set.Demand（）；
B、B.set.Assert（）；
C、C.set.PermitOnly（）；
D、D.set.Deny（）；
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