A client has a laptop screen and an external screen. Which of the following is the BEST way to

toggle between the two or show both at the same time?

A.
Function keys on keyboard

B.
Task Manager

C.
Display settings in Control Panel

D.
Turn the monitors on and off

Explanation:

http://superuser.com/questions/393827/how-to-toggle-between-different-monitors-withone-key-on-windows-7