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.