You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft NET Framework 4. The application retrieves customer data from an enterprise resource planning (ERP) system. You need to ensure that the following requirements are met:
"Customer data is retrieved only once.
"Customer data is available on multiple forms within the application.
" Forms can implement Two-Way binding to the customer data
What should you do?
A. Store the results of the query in a static Data Table object that is used by all the forms.
B. Store the results of the query in a local XML file. Bind all forms to an XML Data Adapter object that references the local XML file.
C. Design a static class for the data that implements the IObservable interface.
D. Design a static class for the data that implements the INotifyPropertyChanged interface. Raise the Property Changed event to notify the forms when data is changed.
