The data collected by the statistical survey can be original data or secondary data. The relationship between the original data and secondary data is ( ) A: The original data comes from the grass-roots units, and the secondary data comes from the superior units B: Secondary data is processed from original data C: There is no necessary connection between the original data and the secondary data D: There is no difference between primary data and secondary data

Detecting and correcting data in a database or file that are incorrect, incomplete, improperly formatted, or redundant is called: A: defragmentation. B: data scrubbing. C: data auditing. D: data optimization.

如果希望在关闭浏览器前删除cookie文件，使用下列（ ）函数实现。 A: setcookie('data','PHP',time()+1); B: setcookie('data','',time()+1); C: setcookie('data','PHP',time()-1); D: setcookie('data','',time()-1);

What is the primary difference between data and information?() A: Information<br/>is processed to get data. B: Data<br/>is processed to get information. C: Data,<br/>unlike information, is related to hardware. D: Data<br/>is stored, information is not.

Your data recovery strategy must meet the following requirements:·Back up all data files and folders in C:Data.·Restore individual files and folders in C:Data.·Ensure that data is backed up to and restored from external media.What should you do?（） A.A B.B C.C D.D