David Installed a New Set of Drivers for One of His

Multiple Choice

David installed a new set of drivers for one of his hardware components. Since then, the computer has not been able to boot to the OS. Which of the following is a possible first step towards resolving this problem?

A) Rewrite all the lines in CONFIG.SYS or AUTOEXEC.BAT.
B) Check that the hardware device is plugged in properly.
C) Reinstall the operating system.
D) Reboot to the Last Known Good Configuration.