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单项选择题 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.Assert();

C、set.PermitOnly();

D、set.Deny();

  • A
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