Which method should you use for Xbox Live networking to function correctly on the Xbox 360 and Windows PC devices?

Which method should you use for Xbox Live networking to function correctly on the Xbox
360 and Windows PC devices?

A.
Game.Update()

B.
NetworkGamer.UpdateQ

C.
NetworkData.Update()

D.
NetworkSession.Update()

Explanation:
http://msdn.microsoft.com/enus/library/microsoft.xna.framework.net.networksession.update.aspx