An operating system provides at least two major layers of abstraction - the abstract virtual machine (software services abstraction) and hardware abstraction. What is not one benefit of these abstractions?

1They afford the OS a simplified path to evolve with changing hardware and software ecosystem.

2	They enable the OS to prioritize among running programs according to their relative importance.

3	They allow writing generic code without concern about the details of the computer system.

4	They provide multi-layer isolation between user code and sensitive system resources, and thus extra security.