If you suspect a computer is infected with a virus and you are ready to upgrade from Windows $8\mathrm{.}1$ to Windows $10,$ what is your best practice? a$.$ Scan the system for malware before you perform the Windows $10$ upgrade. b$.$ Completely erase the hard drive with a full format, and then install Windows $10.$ c$.$ Install Windows $8\mathrm{.}1$ as an in$-$place upgrade to remediate the system, and then upgrade to Windows $10.$ d$.$ Perform a clean install of Windows $10$ rather than an upgrade.