Which three structures belong to the Xna.Framework.Input namespace?

Which three structures belong to the Xna.Framework.Input namespace? (Choose three.)

A.
GamePadState

B.
KeyboardState

C.
MouseState

D.
SamplerState

E.
inputstate

Explanation:

http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.input.aspx