Virtualization Separates Business Applications and Data from Hardware Resources

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

A) Cloud virtualization combines SaaS apps from multiple clouds into a single virtual cloud for a seamless computing experience.
B) 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.
C) 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.
D) 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.