In what view are you likely to see the following output？（）  
SID SERIAL# EVENT SECONDS_IN_WAIT 
121 269 RMAN backup & recovery I/O 2 
129 415 SQL*Net message from client 63 130 270 SQL*Net message from client  

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.

A. 2 minutes
B. 2 hours
C. 2 days
D. The command will generate an error.
E. This backup is not constrained by any time limitation.

A. Change the retention criteria.
B. Make the lost backup set pieces available to RMAN again.
C. Run the crosscheck command to correct the location for the backup set piece contained in the metadata.
D. Nothing. The backup set piece is lost forever.
E. Call Oracle support，their assistance is required.