Final answer:
To ensure complete isolation of a highly sensitive virtual machine, a Dedicated Host or a Bare Metal Server are the best services to use. Dedicated Hosts provide exclusive use of physical servers to a single user, while Bare Metal Servers offer physical servers without a hypervisor layer, ensuring maximum isolation and security.
Step-by-step explanation:
If you have a virtual machine that requires complete isolation from any other virtual machines, the best service to use would be a Dedicated Host or a Bare Metal Server. A Dedicated Host is a service provided by many cloud providers that allocates physical servers specifically for your use case. This means that no other customers' virtual machines will run on the same physical hardware, ensuring strong isolation. Alternatively, a Bare Metal Server offers even more isolation as it is a physical server dedicated entirely to a single tenant, with no hypervisor layer at all. In this setup, you directly control the entire physical server, thus eliminating the 'noisy neighbor' effect completely and offering the highest degree of security and performance. When selecting such services, it's important to choose a provider that complies with the necessary security and compliance standards relevant to your industry. Additionally, virtualization security features, like hardware-assisted virtualization, secure boot, and virtual machine encryption, can enhance the security of your highly sensitive virtual machine.