Which of the following separates virtual machines logically, preventing them from interfering with each other?

The hypervisor is the correct choice because it is the software layer responsible for creating and managing virtual machines (VMs) on a physical host. By providing a virtualized environment, a hypervisor allows multiple VMs to run on the same physical hardware while ensuring that they are isolated from one another. This logical separation is crucial as it prevents one VM from accessing or affecting the data and operation of another VM, thereby enhancing security and stability in a multi-tenant architecture.

The hypervisor achieves this isolation by allocating resources such as CPU, memory, and storage to each VM, managing access and preventing interference. Additionally, it enforces boundaries that stop unauthorized access between VMs. This enables organizations to run various workloads on a single physical server without the risk of one workload compromising another.

In contrast, the other options do not provide this level of separation. Microservices refer to an architectural style for building applications that are composed of small, independent services, while "full stack" describes a combination of various technologies involved in application development but does not pertain to the logical separation of resources. The term "application" is too broad and refers generally to software that performs specific tasks, without the context of virtual machine isolation. Thus, the hypervisor is the key