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 prior-page
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.