In which version of DOS. CHKDSK command has been changed to SCANDISK?

In which version of DOS. CHKDSK command has been changed to SCANDISK?

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1) Which two of the following DOS commands are used to display or set the date and time of your computer's infernal clock?

2) internal command in Dos are

3) To conserve battery power on your laptop computer. What DOS v6.x command should you use?

4) Which command is used to copy files?

5) While working with MS-DOS, which command is used to restore files that were backed up using the BACKUP command?