You are developing a Windows Store app that integrates with a stock trading website on the
Internet.
The app must meet the following requirements:
The app must allow the user to view stock details.
The app must be able to get the updated stock information every five minutes from an Internet web
service.
You need to configure the app to meet the requirements.

What should you do?

A.
Create a BackgroundDownloader object and then call the CreateDownloadAsync() method to
specify the frequency of the stock information update.

B.
Add a Background Tasks declaration in the package.appxmanifest file and select the timer task
type to collect stock information periodically.

C.
Enable the Home or Work Networking capability in the package.appxmanifest file.

D.
Enable the Lock Screen Notifications capability in the package.appxmanifest file.

Explanation:
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh977049.aspx