You are upgrading a stand-alone Windows Presentation Foundation (WPF) application and an XAML browser application (XBAP) to Microsoft .NET Framework 4. You plan to add .NET 4 types and members to…

You are upgrading a stand-alone Windows Presentation Foundation (WPF) application and an XAML browser application (XBAP) to Microsoft .NET Framework 4. You plan to add .NET 4 types and members to both applications. Both applications consume a common utility assembly that modifies files on a local file system. The utility assembly requires full trust. You need to ensure that both applications can use the common utility assembly without any security-related exceptions. What should you do?