View the Exhibit to examine the output for the CROSSCHECK BACKUP command. Which statement is true about the output of the command（）
- AThe backup piece is expired as the new backup is available.
- BThe backup piece is expired because the operating-system file was not found.
- CThe backup piece is expired because the retention period for the backup has expired.
- DThe backup piece is expired because the backup set to which it belongs is not complete.