Which two guest operating systems are supported when a virtual machine must be deployed?

iOS is a mobile operating system designed for Apple devices and is not generally supported as a guest operating system for deployment on standard virtualization platforms.

Microsoft Windows, including various client and server editions, is one of the most widely supported guest operating systems across almost all enterprise virtualization platforms like VMware vSphere, Hyper-V, and KVM.

Android is primarily a mobile operating system; while emulators exist, it is not typically supported as a standard guest operating system for deployment on enterprise virtualization platforms.

macOS can be virtualized on various platforms, particularly on Apple hardware or through specific licensing on hypervisors like VMware ESXi and Fusion, making it a supported guest operating system in many scenarios.

T/TOS (Tandem Transactional OS) is a highly specialized, proprietary operating system for HPE NonStop systems and is not supported as a guest OS on general-purpose virtualization platforms.