【单选题】
You are creating a new security policy for an application domain. You write the following lines of code. <br /> PolicyLevel policy = PolicyLevel.CreateAppDomainLevel（）； <br /> PolicyStatement noTrustStatement =   <br /> new PolicyStatement（ <br /> policy.GetNamedPermissionSet（"Nothing"））；<br /> PolicyStatement fullTrustStatement =   <br /> new PolicyStatement（ <br /> policy.GetNamedPermissionSet（"FullTrust"））； <br /> 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&
A、A
B、B
C、C
D、D
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