Which two environments can you use to write games on Windows Phone 7? (Choose two.)

A.
Microsoft Silverlight 4

B.
Adobe Flash 10

C.
XNA4.0

D.
Microsoft DirectX 11

Explanation:
http://msdn.microsoft.com/library/windows/apps/ff472340(v=vs.105).aspx
http://msdn.microsoft.com/en-us/library/windows/apps/hh465149.aspx