（单选题）
View the Exhibit to examine the output for the CROSSCHECK BACKUP command. Which statement is trueabout 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
正确答案
答案解析
略
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