3. Explain with an example of your own choosing how REA modeling can serve as an accountability infrastructure for enterprise information systems architectures at three levels of abstraction: (a) value chain level, (b) the business process or REA entity pattern level, and (3) the task level. Include some discussion of process abstraction in your answer and be sure to deal with the difficult issues of representation (what not to identify, what to do with workflow procedures, what to simply leave out, etc.)