11. Write the DOS command to obtain on-line help about the XCOPY command. 12. Write the DOS command to print the directory listing of drive A on the printer. 13. Write the DOS command to display a directory listing of the files in drive A in file-size order, largest first. 14. Write the DOS command to make a sub-directory named NEWDIR. 15. Write the DOS command to copy a file named FILEFRED from the DIRECT1 subdirectory on drive A to a directory named DIRECT2 located at the root of drive C. 16. Write the DOS command to rename all the files on drive A which have the .HTML filename extension to have the .HTM filename extension. 17. Write the DOS command to change the command prompt to C:\> 18. Write the DOS command to copy a file named FILEFRED and name the new copy FILESUE. 19. Write the DOS command to find a file named MATILDA which is stored in a sub-directory somewhere on drive C