Which code snippet should you insert in Target 1 to complete the code?

HOTSPOT
You are developing a Windows Store app to check the weather.
You need to ensure the app polls an external web service once per hour for tile updates.
You have the following code:

Which code snippet should you insert in Target 1 to complete the code? (To answer, select the
correct code snippet from the dropdown list in the answer area.)

Answer:

Explanation:
http://msdn.microsoft.com/enus/library/windows/apps/windows.ui.notifications.tileupdater.startperiodicupdate.aspx