You are using windows installer to deploy an application to 750 Windows 2000 Professional computers on your network. The network includes organizational unit （OU） named sales. A Group Policy object （GPO） is created for the Sales OU. You want to deploy that application in such a way that the shortcuts of that application should be created on the used desktop as well as in start-menu. When a user first click on the shortcut or try to open any file whose extension is associated with that application， then that application should automatically install on the computer. What should you do to accomplish this task？（）
- AUsing GPO， publish that application at user level
- BUsing GPO， assign that application at the user level
- CUsing GPO， publish that application at computer level
- DUsing GPO， assign that application at the computer level.