You are an IT technician for your company. Fred calls you complaining that every time he opens his internet browser, the default home page has been changed to a site he is not familiar with. You suspect this change is being caused by a malware infection on his system. However, after you run antimalware and antivirus software on Fred's system, it is still having the same issue. Which of the following would be the next BEST way to remove the malware?

a. Format Fred's disks and perform a clean installation of the operating system.
b. Fred's computer to a known good point.
c. Purchase a new disk and deploy a backup image of Windows.
d. Restore Fred's computer back to a previous restore point.
e. Perform an image deployment from a backup image to restore