Virtualization separates business applications and data from hardware resources. Which of the following was not a type of virtualization?

Hardware virtualization is the use of software to emulate hardware or a total computer environment other than the one the software is actually running in$.$

Cloud virtualization combines SaaS apps from multiple clouds into a single virtual cloud for a seamless computing experience.

Network virtualization combines the available resources in a network by splitting the network load into manageable parts, each of which can be assigned $($or reassigned$)$ to a particular server on the network.

Storage virtualization is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console.