A technician has been tasked with upgrading a Windows $7$ computer to Windows $8.$ The technician was asked to keep all user files and settings intact, but no trace of the Windows $7$ operating system can remain after the upgrade is complete. Which of the following installation and upgrade methods and utilities are capable of satisfying all of the goals mentioned?

Unattended installation

Clean installation and Windows Easy Transfer

Multiboot installation

Upgrade installation

Windows Upgrade Advisor