A、 The entire backup will fail.It will not be usable for recovery.
B、 The entire backup will failbut any datafile successfully backed up will be usable for recovery.
C、 If this backup fails，subsequent backups will prioritize datafiles not backed up.
D、 If this backup fails，an error will be raised and any other commands will not be executed. 
E、 If this backup fails，no error will be raised and any other commands will be executed.