You are creating a Windows Forms Application by using the .NET Framework 3.5.Users use the application to process and approve invoices. A list of recently accessed invoices is stored in the users settings section of the App.config file.You need to maintain the list of invoices from the last persisted state.What should you do？（）

A. Use the Properties.Settings object during runtime.
B. Use the Properties.Settings.Default object during runtime.
C. Use the ConfigurationManager.AppSettings object during runtime.
D. Use the ConfigurationManager.GetSection method during runtime.