单项选择题

A.Open the file using the menu option file->open make the changes and recompile the report. 
B.Convert the file into .REP file using the report compiler make the changes and convert the file back to a .REX file. 
C.Execute the R30CONV command to convert the file to a .RDF file, make the changes and convert the file back to a .REX file. 
D.Choose file -> administration->compile. Convert the file to a .REP file, make the changes and convert the file back to a .REX file. 
E.Execute the R30CONV command to convert the file to a .REP file, make the changes and convert the file back to a .REX file.