You are creating a Windows application by using the .NET Framework 3.5.
The application is used to browse through purchase orders. The purchase order data is stored in a file on
the local computer.
The application synchronizes purchase order data with a central database by using a Web service.
You discover that other applications on the computer can access the purchase order data.
You need to ensure that the purchase order data can be accessed only by the Windows application.
What should you do?

A.
Use the ZipPackage class to store the purchase order data

B.
Use the RijndaelManaged class to encrypt the purchase order data.

C.
Use the IsolatedStorageFileStream class to store the purchase order data.

D.
Add the PrincipalPermission class to the method that reads the purchase order data.