Which XNA game class method is called to process game logic such as modifying the geometry of a game scene or working with user input?

Which XNA game class method is called to process game logic such as modifying the
geometry of a game scene or working with user input?

A.
Game.LoadContent

B.
Game.Initialize

C.
Game.Draw

D.
Game.Update

Explanation:
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.game.update.aspx