The correct answer is: D. no such service
Virtualization is the process of creating a virtual version of something, such as a computer, server, operating system, or storage device. It can be used to improve efficiency, reliability, and security.
IaaS (Infrastructure as a Service) is a cloud computing service that provides virtualized computing resources over the Internet. These resources include servers, storage, networking, and operating systems. IaaS is a good choice for businesses that need to scale their IT resources up or down quickly and easily.
SaaS (Software as a Service) is a cloud computing service that provides software applications over the Internet. These applications are typically accessed through a web browser. SaaS is a good choice for businesses that need to use software applications that are not available on-premises.
PaaS (Platform as a Service) is a cloud computing service that provides a platform for developing, testing, and deploying applications. This platform includes a set of tools and services that make it easier to develop and manage applications. PaaS is a good choice for businesses that need to develop and deploy applications quickly and easily.
In the question, virtualization occurs at application level, OS level and hardware level. This means that the entire system is virtualized, including the hardware. This type of virtualization is not offered by any of the cloud computing services listed above. Therefore, the correct answer is: D. no such service