A risk register is a tool that records and tracks the identified risks, their causes, impacts, likelihood, responses, and owners. A decentralized risk register is maintained by each business unit or function, while a consolidated risk register is maintained at the enterprise level. The greatest concern with maintainingdecentralized risk registers instead of a consolidated risk register is that the aggregated risk may exceed the enterprise’s risk appetite and tolerance. Risk appetite is the amount and type of risk that an enterprise is willing to accept in pursuit of its objectives, while risk tolerance is the acceptable level of variation around the objectives. If the risk registers are not consolidated, the enterprise may not have a holistic view of its risk profile and may not be able to prioritize and allocate resources effectively. The other options are also concerns, but they are not as significant as the potential misalignment between the aggregated risk and the enterprise’s risk appetite and tolerance. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 1, Section 1.2.2.2, pp. 21-22.