The correct answer is B. Hypervisor. A hypervisor is the software layer that enables virtualization. It allows multiple virtual machines or guest operating systems to share the same physical computer and controls how physical resources such as CPU, memory, storage, and networking are assigned to those virtual systems. A guest OS uses the resources assigned to it but does not manage the overall allocation. PaaS and SaaS are cloud service models, not the virtualization component that allocates virtual computer resources.
Exact Extract/Reference: The Tech+ Study Guide states that the hypervisor is “also known as a virtual machine manager (VMM)” and “manages the physical resource allocation” to virtual operating systems. The Exam Essentials also states that a hypervisor “allows multiple operating systems to share the same host” and manages physical resource allocation.
