A.run{openscriptbackup_database；runscriptbackup_database}
B.run{engagescriptbackup_database；}
C.run{runscriptbackup_database；}
D.Run{executescriptbackup_database；}
E.Thenamebackup_databaseisaninvalidnameforanRMANscript.TryingtorunitfromRMAN wouldresultinanerror.