You create a mobile service to send push notifications to the app.
You configure the service and the app to work with Windows Push Notification Services (WNS).
You add the following code to the App.xaml.cs file:

You need to ensure that the app can access the push notification channel.
What should you do first?

A.
Add a call to GetChannel in the OnLaunched event handler of the app.

B.
Set the Uri property of pushChannel in the OnActivated event handler of the app.

C.
Set the Uri property of pushChannel in the OnLaunched event handler of the app.

D.
Add a call to GetChannel in the OnActivated event handler of the app.