单项选择题
You need to create a class definition that is interoperable along with COM.You need to ensure that COM applications can create instances of the class and can call the GetAddress method.
Which code segment should you use？（）
A.A
B.B
C.C
D.D
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You are creating a new security policy for an application domain. You write the following lines of code. PolicyLevel policy = PolicyLevel.CreateAppDomainLevel（）； PolicyStatement noTrustStatement = new PolicyStatement（ policy.GetNamedPermissionSet（"Nothing"））； PolicyStatement fullTrustStatement = new PolicyStatement（ policy.GetNamedPermissionSet（"FullTrust"））； You need to arrange code groups for the policy so that loaded assemblies default to the Nothing permission set. If the assembly originates from a trusted zone， the security policy must grant the assembly the FullTrust permission set. Which code segment should you use？（）
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