You are designing an n-tier .NET Framework 4 solution that includes a Windows Presentation Foundation (WPF) application and a Windows Workflow Foundation (WF) component. The WF component contains functionality to incorporate frequently changing rules. You need to recommend a tier for the deployment of the WF component that will not degrade the performance of the WPF application. Which tier should you recommend?
A. business
B. data access
C. data
D. presentation
