You are creating a Windows Forms application by using the .NET Framework 3.5. The application is configured to use rolebased security.You need to ensure that users can print reports only by selecting a printer from the printer dialog box. You want to achieve this goal by using the minimum level of permission.  
Which code segment should you use？（）

You are creating a Windows Forms application that has the print functionality by using the .NET Framework 3.5. You implement the PrintPage page event for the form.You associate an instance of the PrintDocument control along with an instance of the PrintPreviewDialog control named prevDialog1.You want to set the default size of the PrintPreviewDialog class to full screen.  
You need to provide a print preview for the user by adding a code segment to the Click event of the button on the form.  
Which code segment should you use？（）