You are designing a Windows Phone 7 application that includes data entry functionality. The application will require data to be saved when users click the Start button. The data must be available in the application regardless of how the application is exited and re-entered. You need to recommend a way to ensure the availability of user data. What should you recommend?

A.
Use the Closing and Deactivated events to store the data to isolated storage.

B.
Use the Closing and Deactivated events to store the data in the PhoneApplicationService.State dictionary.

C.
Use the OnNavigatedTo() method to store the data to isolated storage.

D.
Use the OnNavigatedFrom() method to store the data in the PhoneApplicationService.State dictionary.