You have a computer that runs Windows 7. A user installs a third-party media player on the computer. Youdiscover that all media files automatically open by using the third-party media player. You need to ensurethat all media files open automatically by using Windows Media Player. You must achieve this goal by usingthe minimum amount of administrative effort. What should you do?（）

A. Select a media file. Right-click the file and select Open with.
B. Select a media file. Right-click the file and select Restore previous versions.
C. From Control Panel， modify the Set your default programs settings.
D. From Control Panel， modify the Set program access and computer defaults settings.