5. Write the DOS command to display all files on drive A whose filenames are seven characters long and begin with the letters CHAR. 6. Write the DOS command to clear the screen and display the system prompt in the upper left hand corner of the screen. 7. Write the DOS command to display the files on drive A: that have the .DOC filename extension. 8. Write the DOS command to copy a diskette using drive A. 9. Write the DOS command to create the volume label WORD BACKUP on drive A