A. Most systems can be thought of as being made up of layers, where the lowest layer is actual hardware and the highest layer is an application program. Do some brainstorming to consider a trash compactor. Outline a four layer model.

B. For a single a given computer, would you expect a translated program to execute faster or slower than an interpreted program. Justify your answer in a few sentences.

C. How does the way computer engineers think about computer architecture and implementation relate to pianos? Specifically, how are the concepts of architecture and implementation each involved?