You are developing a Windows Presentation Foundation (WPF) application. An event triggers a workflow such that a parent control executes the event handlers before the child controls. You need to ensure that if a parent controls event handler encounters an error, the subsequent handlers are not called. What should you do?（）
- A Use handlers for a tunneling routed event and mark the event as handled in the case of a problem.
- B Use handlers for a tunneling routed event and make the event as handled in the finally portion of a try-catch-finally code block.
- C Use handlers for a bubbling routed event and mark the event as handled in the case of a problem.
- D Use handlers for a bubbling routed event and set the Handled property of the RoutedEventArgs object to true in the catch portion of a try-catch-finally code block.