Which statement is true about a container tool?

• A. It is a virtualization hypervisor
• B. Docker creates full separate OS instances for each container
• C. Docker requires dedicated hardware virtualization support
• D. Docker is a popular container tool used to isolate applications

Answer: (D)

Container tools isolate applications using OS-level virtualization rather than running separate full operating systems. They rely on features like namespaces and cgroups to give each application its own user space and resource limits while sharing the host’s kernel. Because of this, they are not virtualization hypervisors, and they don’t spin up separate OS instances for every container. They also don’t require dedicated hardware virtualization support; they work on a standard host OS with a compatible container runtime. Docker fits this model as a popular container tool used to isolate and run applications.