To answer this question, you need to be familiar with the static code analysis tool provided by Microsoft for checking .NET managed code assemblies against the .NET Framework Design Guidelines.
Option A) MsCop - This option is incorrect because there is no known tool called "MsCop" provided by Microsoft for static code analysis.
Option B) FxCop - This option is correct. FxCop is a free static code analysis tool from Microsoft that checks .NET managed code assemblies for conformance to Microsoft's .NET Framework Design Guidelines.
Option C) RsCop - This option is incorrect because there is no known tool called "RsCop" provided by Microsoft for static code analysis.
Option D) DxCop - This option is incorrect because there is no known tool called "DxCop" provided by Microsoft for static code analysis.
The correct answer is B) FxCop. This option is correct because FxCop is the free static code analysis tool from Microsoft that checks .NET managed code assemblies for conformance to Microsoft's .NET Framework Design Guidelines.