You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4. You plan to create a wizard by using a Window, a Frame, and several Page objects. The wizard will use the NavigationService. The NavigationService will be invoked by buttons on the user interface (UI). You need to ensure that priorpage navigation can be disabled. What should you do?

A.
In the button OnClick event, remove the previous wizard page from the journal.

B.
In the button OnClick event, remove the previous wizard page from the Window.

C.
In the button OnMouseDown event, remove the previous wizard page from the Frame.

D.
In the button OnMouseDown event, remove the previous wizard page from the Window.