A. Scanning the system with a Linux live disc, flashing the BIOS, and then returning the computer to service
B. Flashing the BIOS, reformatting the drive, and then reinstalling the OS
C. Degaussing the hard drive, flashing the BIOS, and then reinstalling the OS
D. Reinstalling the OS, flashing the BIOS, and then scanning with on-premises antivirus