A technician needs to decrease the time it takes to install an operating system on 100 computers. Which of the following installations would the technician use to reduce hands-on time spent on each…

An upgrade installation still requires a technician to initiate and monitor the process on each machine and does not reduce hands-on time across many systems.

A USB installation is simply a media type for delivering setup files and still requires a technician to interact with each machine at each installation step.

An unattended installation uses a pre-configured answer file (such as unattend.xml in Windows) that automatically responds to every setup prompt without human intervention. When deploying to 100 machines this approach dramatically reduces hands-on technician time because the installation runs to completion autonomously after being initiated.

A clean installation wipes and installs fresh but requires manual interaction at each machine, making it no faster per-system than a standard install.