21. The COPY command of MS-DOS, is used to:

A. copying files from one floppy disk to another floppy disk
B. copying one or more files on the same disk or directory
C. copying two or more files into a single file
D. All of the above
E. None of the above

22. Which of the following filename extension suggests that the file is a backup copy of another file?

A. BAK *
B. BAS
C. COM
D. TXT
E. None of the above

23. While working with MS-DOS, which command is used to compare the disk in drive A with the disk in drive B, specifying to compare only first side of each disk, and only the first 8 sectors of each track?

A. DISKCOPY A: B:/8
B. DISKCOMP A: B:/l/8
C. DISKCOMP A: B:/8
D. DISKCOMP A: B:/l
E. None of the above

24. While working with MS-DOS, which command will you use to display the version?

A. DATE Command
B. VER Command
C. DISK Command
D. FORMAT Command
E. None of the above

25. What type of commands are individual programs kept, as separate files on the hard disk (DOS diskette)?

A. External
B. Internal
C. Change
D. File
E. None of the above