MCSA XP

Answer - C - By default, the Warn option displays a message before installing an unsigned device driver on a Windows XP OS.

Key Takeaway: Windows XP includes three different options for driver signing. The option that is chosen, instructs the Windows XP OS what to do when you are trying to install an unsigned driver. The Ignore option, if chosen will automatically install the unsigned drivers. The Warn option displays a warning and will let you choose an action during the unsigned driver installation. The Block option makes sure that unsigned drivers are never installed on the computer.