View the Exhibit to examine the output for the CROSSCHECK BACKUP command.  Which statement is true about the output of the command（）

• A、The backup piece is expired as the new backup is available.
• B、The backup piece is expired because the operating-system file was not found.
• C、The backup piece is expired because the retention period for the backup has expired.
• D、The backup piece is expired because the backup set to which it belongs is not complete.