Which XNA object should you use in your game to get the screen size?

Which XNA object should you use in your game to get the screen size?

A.
Microsoft .Xna.Framework.Graphics.RasterizerState

B.
Microsoft.Xna.Framework.Media

C.
Microsoft.Xna.Framework.Graphics.SpriteBatch

D.
Microsoft.Xna.Framework.GraphicsDeviceManager.GraphicsDevice.DisplayMode

Explanation:
http://msdn.microsoft.com/enus/library/microsoft.xna.framework.graphics.graphicsdevice.displaymode.aspx