An application fails to start after a Technology Level upgrade. The application vendor recommends that two filesets upgraded as part of the new Technology Level be rejected.  What is the recommended method for performing this task？（）  

A.Run instfix -u to reject the filesets.
B.Run installp -r to reject the filesets.
C.Run installp -u to uninstall the filesets.
D.Restore the system to previous state from the system backup.