1. Given a virtual machine design where guest operating systems run as independent virtual machines supported by a host operating system. Detail the considerations that are involved in selecting a target operating system to serve as a potential host for the design and implementation of a virtual machine monitor that would support a specific guest operating system.

3. The X25-Demoulator machine has been upgraded to modern computer architectural standards. Additionally, the X25 OS supports pre-emptive multitasking and a one-to-one relationship between user-level threads and kernel-level threads which allows one or more threads from a process to issue blocking system calls while other threads (within that process) continue to run. Explain with design detail how the X25 kernel may provide for a user-level thread implementation?

3. Is operating system reliability and protection enhanced with the microkernel approach to system design? Provide detailed support for your answer including design and implementation points.