Which statement is not correct?
in a file approach to data management, the data definitions are included in each application separately.
the file approach to data management causes the same information to be stored separately for different applications.
in a file approach to data management, a change in the structure of a data file is easily handled because each application has its own data files.
in a file approach to data management, different applications could be using older and newer versions of the same data."

Option C is not correct because in file system there is problem of using same data at different place with old and new updated versions and thus change in the data on one file is not reflected on the other related files implicitly rather we will have to change the data in each file manually which is indeed not easy task. In fact that is one of the biggest drawback of file system.

Option A is correct because the files of different data has separate definitions of the topics they are about.

Option B is correct because has no reversibility and thus same data can be present on different files.

Option D is correct because because of no reversibility the files can have same records with new or old versions

answertrue;

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)