Keisha is a network administrator. She wants a cloud$-$based service that will allow her to load operating systems on virtual machines and manage them as if they were local servers. What service is Keisha looking for?

Remote Authentication Dial$-$In User Service $($RADIUS$)$

Infrastructure as a Service $($laaS$)$

Platform as a Service $($PaaS$)$

Software as a Service $($SaaS$)$