You need to ensure that the user can display additional desktop space on the external monitor

You update the video card driver on a portable computer that runs Windows 8.
When a user connects the portable computer to an external monitor, the external monitor
duplicates the display on the portable computer screen.
You need to ensure that the user can display additional desktop space on the external
monitor.
What should you do?

A.
Run the DisplaySwitch /extend command.

B.
Start the computer from the Windows 8 installation media and perform a system image
recovery.

C.
Roll back the video card driver to the previous version.

D.
Run the sic /scannow command.