26. After upgrading your computer to a new DOS version, an older application displays the error message “Incorrect DOS version”. What should you do to run this application?

A. Use the DOS+ command
B. Use the SETVER command
C. Restore the old DOS version
D. Contact the application’s vendor support line
E. None of the above

27. When executed from a bootable hard drive, which command will make a formatted floppy disk bootable?

A. COPY C:\DOS\COMMAND.COM A:\
B. ATTRIB C:\*.SYS A:\
C. XCOPY C:\DOS\*.* A:\
D. SYS C: A:
E. None of the above

28. Which of the following commands allows you to make a directory?

A. MAKE
B. DIR
C. MD
D. DD
E. None of the above

29. While working with MS-DOS, which command is used to specify the color display, 40 columns and color?

A. MODE COLOUR
B. MODE/C
C. MODE CO40
D. MODE CHANGE
E. None of the above

30. Which DOS command allows you to compress existing disks and to create new compressed volumes?

A. DEFRAG
B. DBLSPACE
C. SCANDISK
D. MSAV
E. None of the above